from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A protective sheath enclosing the shoot tip and embryonic leaves of grasses.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A pointed sheath that protects the emerging shoot in monocotyledons such as oats and grasses.
from The Century Dictionary and Cyclopedia
- n. Same as coleophyl.
From New Latin coleoptilum : Greek koleon, sheath; see kel-1 in Indo-European roots + Greek ptilon, plume; see pet- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
Based on Ancient Greek κολεός (koleos, "sheath") + πτίλον (ptilon, "feather"). (Wiktionary)