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Co*lum"bi*um (?), n. [NL., fr.
Columbia America.] (Chem.) A rare element of
the vanadium group, first found in a variety of the mineral
columbite occurring in Connecticut, probably at Haddam. Atomic
weight 94.2. Symbol Cb or Nb. Now more commonly called
niobium.

Co*lum"bo (?), n. (Med.)
See Calumba.

Col`u*mel"la (?), n. [L., dim. of
columen column. See Column.] 1.
(Bot.) (a) An axis to which a carpel
of a compound pistil may be attached, as in the case of the
geranium; or which is left when a pod opens.
(b)A columnlike axis in the capsules of
mosses.

2. (Anat.) A term applied to
various columnlike parts; as, the columella, or
epipterygoid bone, in the skull of many lizards; the
columella of the ear, the bony or cartilaginous rod
connecting the tympanic membrane with the internal ear.


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