any of a number of columnlike structures in plants and animals, as a small bone in the middle ear of amphibians, reptiles, etc.
Origin of columellaModern Latin from L, diminutive of columen: see column
Any small columnlike structure in various plants and animals, often forming the central axis of development for the organism or an anatomical structure.
Origin of columellaLatin diminutive of columna column ; see column .
- (biology) Any of various small structures in plants or animals that are columnar in shape.
- (anatomy) The skin at the end of the septum which separates the nostrils.
- (comparative anatomy) In birds, reptiles, and amphibians, the small bone which carries vibration from the tympanum to the inner ear.
- (malacology) In gastropods, the structure at the center of the whorls of the shell.
- (coral science) The structure at the center of the calyx where the septa join together.
- (mycology) The central sterile portion of the sporangium in various fungi.
- (palynology) A rod-shaped reinforcing element of the sexine layer of a pollen grain.
From Latin columella (“small column”).