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phototropism

Noun

pho=to=trop=ism

WORDNET DICTIONARY

phototropism, n. [Photo- + Gr. to turn.].

The tendency of growing plant organs to move or curve under the influence of light. In ordinary use the term is practically synonymous with heliotropism. [Webster 1913 Suppl.]
exhibiting movement in a direction toward (positive phototropism) or away from (negative phototropism) a source of light. [PJC]

phototropism, n. the tendency of a plant etc. to bend or turn towards or away from a source of light.

Derivative

phototropic adj.

For further exploring for "phototropism" in Webster Dictionary Online