[hee-lee-uh-trop-ik, -troh-pik] 
| turning or growing toward the light. |
| he·li·ot·ro·pism (hē'lē-ŏt'rə-pĭz'əm) n. Growth or orientation of a sessile organism, especially a plant, toward or away from the light of the sun. he'li·o·trop'ic (-ə-trŏp'ĭk) adj., he'li·o·trop'i·cal·ly adv. |
| heliotropism (hē'lē-ŏt'rə-pĭz'əm) Pronunciation Key
The growth or movement of a fixed organism, especially a plant, toward or away from sunlight. Heliotropism can be easily seen in sunflowers, which slowly turn their large flowers so that they continually face the sun. heliotropic adjective (hēl'lē-ə-trō'pĭk, -trŏp'ĭk) |
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