allo-, all- +

(Greek: different, other, another; divergence; a combining form denoting a condition differing from the normal or a reversal, or referring to "another")

allegory
1. A work in which the characters and events are to be understood as representing other things and symbolically expressing a deeper, often spiritual, moral, or political meaning.
2. The symbolic expression of a deeper meaning through a story or scene acted out by human, animal, or mythical characters: "George Orwell's Animal Farm novel is an allegory in which animals behave and talk like humans.".
3. A symbolic representation of something.
4. A story in which people, things, and happenings have a hidden or symbolic meaning.

Allegories are used for teaching or explaining ideas, moral principles, etc.

5. Etymology: a description of one thing under the image of another; from allos,, "other" plus agoreuein, "to speak openly in an assembly" from agora, "marketplace, place of assembly".
allenthesis
Introduction of a foreign substance, or elements, into the body.
allergen
A substance that is foreign to the body and can cause an allergic reaction in certain people; examples include: pollen, dander, mold; ragweed pollen is the allergen which causes hay fever.
allergization
1. Active sensitization or the introduction of allergens into the body.
2. The process of becoming sensitive to an allergen.
allergy
1. A misguided reaction to foreign substances by the immune system, the body system of defense against foreign invaders, particularly pathogens (the agents of infection): "When the woman was in the room with the cat for a few minutes, her allergy became apparent as she started to sneeze over and over again."
2. Etymology: from about 1911, from German Allergie, coined in 1906 by Clemens E. von Pirquet (1874-1929), Austrian pediatrician, which came from Greek allos, "other, different, strange" + ergon, "activity".

The allergic reaction is misguided in that these foreign substances are usually harmless. The substances that trigger allergy are called allergen. Examples include pollens, dust mite, molds, danders, and certain foods. People prone to allergies are said to be allergic or atopic.

Although allergies can develop at any age, the risk of developing allergies is genetic. It is related to one's family history of allergy. If neither parent is allergic, the chance for allergies is about 15 percent. If one parent is allergic, the risk increases to 30 percent and if both are allergic, the risk is greater than 60 percent.

Hay fever (allergic rhinitis) is the most common of the allergic diseases and refers to seasonal nasal symptoms that are due to pollens. Year round or perennial allergic rhinitis is usually due to indoor allergens, such as dust mites or molds.

Symptoms result from the inflammation of the tissues that line the inside of the nose (mucus lining or membranes) after allergens are inhaled. Adjacent areas, such as the ears, sinuses, and throat can also be involved.

allesthesia (s) (noun), allesthesias (pl)
A condition in which a sensation; such as, of pain or even a slight touch, is experienced at a point away from where the stimulus occurs: Allesthesia is the inability to tell which side of the body has been touched and if one extremity is stimulated, the sensation is felt on the opposite side.
allesthetic (adjective), more allesthetic, most allesthetic
A reference to the sensation of a stimulus in one limb which is referred to the contralateral (opposite) limb: Raymond was confused by the allesthetic pain that occurred in his right foot when it was his left shoe that was too tight and pinching his foot.
alloalbumin
Any genetic variant of albumin (the main protein in human blood and the key to the regulation of the osmotic pressure of blood).

Chemically, albumin is soluble in water, precipitated by acid, and coagulated by heat.

Be aware that albumin is spelled with an "i" while "albumen" is spelled with an "e", which is the white of an egg. Albus in Latin refers to "white".

alloantibody
1. An antibody produced by one individual that reacts with alloantigens of another individual of the same species.
2. An antibody that occurs naturally against foreign ("other") tissues from a person of the same species.
alloantigen
An antigen existing in alternative (allelic) forms in a species; therefore, inducing an immune response when one form is transferred to members of the species who lack it; typical alloantigens are the blood group antigens.

The allelic is an alternative form of a gene. One of the different forms of a gene that can exist at a single locus (spot on a chromosome). Also one of the different forms of any segment of a chromosome.

alloantiserum
A serum that contains alloantibodies.
alloarthroplasty (s) (noun), alloarthroplasties (pl)
The surgical removal of part of a structure or bodily organ or the surgical reconstruction or replacement of a malformed or degenerated joint with another part: Dr. Watts, the orthopedic surgeon, explained the alloarthroplasty process to Mr. Jason, explaining that the replacement of his painful bone links were in fact a standard operation.
allobar
1. A form of a chemical element having an atomic weight different from that of the naturally occurring form.
2. An isotope with a different atomic weight than the naturally occurring form of the same element.
allobiosis
1. The condition of altered reactivity which an organism manifests under changed environmental or physiologic conditions.
2. The changed activity exhibited by an organism when subjected to an altered (another) environment.
3. A form of an element that has isotopic abundances that are different from the naturally occurring form; for example, "depleted" uranium has had most of the uranium-235 removed, and is an allobar of natural uranium.
allobiosphere (s) (noun), allobiospheres (pl)
That part of the earth's surface and surrounding air that is capable of supporting life in which heterotrophic (dependent on other sources for food) organisms occur but into which organic food material must be transported because the primary production does not take place where they are: "Most of the occupants of the various allobiospheres usually depend on green plants that include elements of solar energy that have been converted into chemical energy which is food for the various species of animal life."

"Another allobiosphere has been discovered at the bottom of the seas where hot springs come up from that part of the Earth that is deep below the surface or on the sea floor where hot springs hav animals that have independence from green plants but that depend on bacteria that utilize the energy of chemicals from the hot springs."

"Ocean depths are the most extensive and permanent example of the allobiosphere where great areas of cold and regions where there is no light and so there is no active plant life; however, explorers of the depths of the ocean have discovered various animals; such as, worms, prawn-like creatures, and many types of fish that live in these locations."

"The ecologist G. Evelyn Hutchinson coined the term allobiosphere for these environments, where plant life and its photosynthesis are replaced by environmental extremes of darkness, heat, or cold, but where life continues, life that depends for nourishment from materials that come from other places."

—This information was compiled from the following sources:
"The Allobiosphere", WorldandISchool.com; "Life in the allobiosphere", UK Pubmed Central;
based on excerpts from "Natural Science", by John S. Edwards; 1988.

Inter-related cross references, directly or indirectly, involving word units meaning "another, other, different, alternating, varied, changing": ali-; alter-; allelo-; hetero-; mut-; poikilo-; reciproc-; vari-.