the GNU version of the Collaborative International Dictionary of English
adj. Relating to, or showing, geotropism.
The Century Dictionary and Cyclopedia
Of or pertaining to, or exhibiting, geotropism; turning or inclining toward the earth.
Word Usage
"The seed should be sown 1-2 cm deep with the micropyle pointing downwards; the emerging root is not strongly geotropic and may come up out of the soil if the seed is planted upside down."