heliotropism
UK/,hiːlɪə(ʊ)'trəʊpɪz(ə)m/US/.hi:li'ɒtrәpizm/
C2
Definitions
n.
The tendency of a plant to turn or grow in response to sunlight.
向日性，趋日性（植物随日光转动或生长的倾向）。
Root Breakdown
Root-derivedhelio- (sun) + trop (turn) + -ism (named tendency) = the phenomenon of turning toward the sun. The abstract noun for what heliotropic plants do.
Root trop still carries 11 more wordsExample Sentences
- 1.
Heliotropism lets young sunflowers maximise the light they catch.
- 2.
The study measured heliotropism in several alpine flowers.