WordReference Random House Unabridged Dictionary of American English © 2026
co•le•op•tile
(kō′lē op′til, kol′ē-),USA pronunciation n. [Bot.]
- Botany(in grasses) the first leaf above the ground, forming a sheath around the stem tip.
- Greek koleó(n) sheath, scabbard + ptílon soft feathers, down
- Neo-Latin coleoptilum
- 1865–70