What does "phototropic" mean?

Having a tendency to move in response to light. An animal or microbe that is positively phototropic will move toward light. One that is negatively phototropic will move away from light.

Phototropic

adj

adj ·Rare ·Advanced level

Definitions

Adjective

1
Having a tendency to move in response to light. An animal or microbe that is positively phototropic will move toward light. One that is negatively phototropic will move away from light.

Etymology

From photo- + -tropic.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.