columella
- Noun. (biology) Any of various small structures in plants or animals that are columnar in shape.
- Noun. (anatomy) The skin at the end of the septum which separates the nostrils.
- Noun. (context, comparative anatomy) In birds, reptiles, and amphibians, the small bone which carries vibration from the tympanum to the inner ear.
- Noun. (malacology) In gastropods, the structure at the center of the whorls of the shell.
- Noun. (context, coral science) The structure at the center of the calyx where the septa join together.
- Noun. (mycology) The central sterile portion of the sporangium in various fungi.
- Noun. (palynology) A rod-shaped reinforcing element of the sexine layer of a pollen grain.
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This entry was last updated on RefTopia from its source on 3/20/2012.