geotropism
n.
"growth downward," 1874, from geo- "earth" + -trope "a turn, direction" (see trope), translating German Geotropismus (1868), which was coined in 1868 by German botanist Albert Bernhard Frank (1839-1900). Related: Geotropic.
〔李〕[ge;-o-;trop;-ismn.] n.向地性 ←trop (GK tropos)=turn 旋转