Dictionary.net

• a-f[=e]-li-o-trop'ik, adj. turning away from the sun. [Gr. apo, away, h[=e]lios, sun, and tropikos, belonging to turning--trep-ein, to turn.]

1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson

• (bot.). Turning from the sun. Hence apheliotropically adv., apheliotropism n. [Greek]

1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry