tropo-, trop-, -tropal, -trope(s), -tropic, -tropism, -tropia, -tropous, -tropy, trep-

(Greek: bend, curve, turn, a turning; response to stimulus)

Don't confuse this tropo-, -tropy element with tropho-, meaning "food, nourishment, nutrition".

acrotropic (adjective)
A reference to or relating to the continued growth of a plalnt in the same direction as the original growth.
acrotropism (noun)
An orientation response resulting in the continued growth of a plant in the direction in which growth originally started.
aerotropic (adjective)
Referring to a movement of an organism toward or away from a supply of air.
aerotropism (s) (noun), aerotropisms (pl)
1. Movement of an organism toward (positive aerotropism) or away from (negative aerotropism) a supply of air.
2. The growth or movement of an organism toward an air supply; such as, an air bubble in a bacterial culture chamber.
3. The reaction to gases, generally to oxygen, particularly the growth curvature of roots or other parts of plants to changes in oxygen tension.
4. An orientation response to a gaseous stimulus.
ageotropism (s) (noun), ageotropisms (pl)
1. The absence of orientation movements in response to gravity: When participating in a space flight simulator, the astronaut experienced ageotropism and so he had no sense of responding to gravity.
2. Turning away from the earth: Elena was studying plant ageotropism and so she was growing plants in a gravity free environment.
3. A reference to parts of plants that would be expected to grow as gravity pulls them down, but instead grow upward; such as, the knee roots of cypress trees: Marcella tripped over the ageotropisms of the tree in the swamp because the roots were sticking up out of the earth.
allotrope (s) (noun), allotropes (pl)
A substance that exists and is metastable in two or more physical forms over a given temperature range: "Allotropes have different chemical and physical properties; for example, graphite and diamond are allotropes of carbon.
allotropism (s) (noun), allotropisms (pl)
The existence of certain elements, in various forms differing in physical properties; such as, carbon black, graphite, and diamond are all pure carbon.
allotropy (s) (noun), allotropies (pl)
The existence of a solid substance in different physical forms: "Tin has metallic and non-metallic crystalline forms while carbon has two crystalline allotropies: diamond and graphite."
amphitropous (adjective)
A description of an ovule or a seed: "Amphitropous seeds are half inverted and straight, with the hilum (scar or point of attachment of the seed) lateral; an ovule that is curved back along its funiculus (free stalk of an ovule or seed) so that the base and micropyle (minute opening on the ovule through which the pollen tube usually enters) are close together."
anatropous (adjective)
An ovule that is inverted and straight, with the micropyle next to the hilum and the radicle (portion of the embryo below the cotyledons that will form the roots, more properly called the caudicle) consequently inferior (lower or below).
anisotropic (adjective), more anisotropic, most anisotropic
1. A reference to having unequal responses to external stimuli: After Jody's stroke, she exhibited an anisotropic response to physical stimuli on her left side.
2. Having properties that vary depending on the various directions of measurements: A crystal has an anisotropic structure because it is stronger along its length than it is from side to side.
3. Not having properties that are the same in all directions: When measuring the transmission of light through the colored glass, Drew, as a scientist, noted a distinct anisotropic pattern because the properties differed depending on the direction in which he turned the glass.
4. Showing different properties as to velocity of light transmission, conductivity of heat or electricity, compressibility, and so on, in different directions: The early scholars of astronomy noted the anisotropic and varying properties of light, heat, etc. of the stars which they could see.
anisotropy (s) (noun)
1. The departure of cosmic microwave radiation from equal intensity in all direcions.
2. The property of a plant that assumes a certain position in response to an external stimulus.
3. A situation when there are unequal responses to external stimuli.
apogeotropic (adjective)
Characterized by the response by an organism of turning away from the earth; such as, plant stems and leaves that grow upward.
apogeotropically (adverb)
apogeotropism (s) (noun), apogeotropisms (pl)
The growth or orientation certain plants away from the earth; negative geotropism.

Inter-related cross references involving word units meaning "bend, curve, turn": diversi-; diverticul-; flect-, flex-; gyro-; meand-; -plex; streph-; stroph-; tors-; verg-; vers-; volv-.