Definitions from Wiktionary (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:  (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 that extends down the middle of the whorls of the shell.
▸ noun:  (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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