Definition of columella in English:

columella

noun

  • 1Zoology
    An ossicle (small bone) of the middle ear of birds, reptiles, and amphibians.

    • ‘Sound is conducted through the middle ear via the stapes or columella (both are ear ossicles derived from the hyomandibular).’
    • ‘In amphibians, the columella shares the oval window with a second bone, the operculum, which communicates by way of an opercular muscle with the pectoral girdle.’
    • ‘A reduced hyomandibula associated with the quadrate in a fish's visceral skull evolved to form the ear ossicle called the stapes, or columella.’
    1. 1.1Anatomy The pillar around which the cochlea spirals.
  • 2Zoology
    The axis of a spiral shell.

    • ‘Higher values mean tube of the shell forms further from the coiling axis, resulting in a wider columella or hollow center’
    • ‘It appears to be cut from a large bivalve and does not have the twisted shape of a whelk or conch columella.’
    • ‘The attachment site of the large Crepidula on the ventral side of the host shell and the presence of algal or sponge borings through the columella of the host indicate that the Oliva shell was possibly occupied by a hermit crab.’
    • ‘On most specimens, the very thin columella in the median part of the shell is either broken or missing (probably resorbed).’
  • 3Botany
    The axis of the spore-producing body of some lower plants.

    • ‘The stapes has neither a columella nor a stapedial foramen.’
    • ‘In maize, endodermal cells are also involved in lateral root formation, giving rise to the newly formed epidermis and columella, while the remaining root-types are formed by the pericycle.’
    • ‘The primary, stout capillitial branches arise from the upper part of the columella, dichotomously branching into flexuose threads.’

Origin

Late 16th century: from Latin, small column.

Pronunciation:

columella

/ˌkɒljʊˈmɛlə/