The condition or characteristic of growing or moving in different directions; the opposite of homogeneous directional growth.
From Greek hetero- 'different' and dromos 'running/direction,' with the noun suffix -y (from Greek -ia). The term is used primarily in botanical and anatomical descriptions.
Helix-shaped plant stems exhibit heterodromy, which is why climbing ivy spirals up trees instead of growing straight up—this twisting actually gives them better mechanical strength.
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