allo-, all- +

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.
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".

Introduction of a foreign substance, or elements, into the body.

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.

1. Active sensitization or the introduction of allergens into the body.
2. The process of becoming sensitive to an allergen.

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.

A condition in which a sensation; such as, of pain or touch, is experienced at a point remote from that at which the stimulus is applied or occurs, as in allochiria (dyschiria, or the inability to tell which side of the body has been touched; and in which, if one extremity is stimulated, the sensation is referred to the opposite side).

A reference to the sensation of a stimulus in one limb which is referred to the contralateral (opposite) limb.

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".

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.

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.

A serum that contains alloantibodies.

Resection (surgical removal of part of a structure or organ) arthroplasty or the surgical reconstruction or replacement of a malformed or degenerated joint with another part.

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.

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.

That part of the biosphere in which heterotrophic organisms occur but into which organic food material must be transported as primary production does not take place.