from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any small columnlike structure in various plants and animals, often forming the central axis of development for the organism or an anatomical structure.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of various small structures in plants or animals that are columnar in shape.
- n. The skin at the end of the septum which separates the nostrils.
- n. In birds, reptiles, and amphibians, the small bone which carries vibration from the tympanum to the inner ear.
- n. In gastropods, the structure at the center of the whorls of the shell.
- n. The structure at the center of the calyx where the septa join together.
- n. The central sterile portion of the sporangium in various fungi.
- n. A rod-shaped reinforcing element of the sexine layer of a pollen grain.
Latin, diminutive of columna, column; see column.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin columella ("small column"). (Wiktionary)