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 (kŏl′yə-mĕl′ə, kŏl′ə-)
n. pl. col·u·mel·lae (-mĕl′ē)
Any small columnlike structure in various plants and animals, often forming the central axis of development for the organism or an anatomical structure.

[Latin, diminutive of columna, column; see column.]

col′u·mel′lar (-mĕl′ər) adj.
col′u·mel′late′ (-mĕl′āt′) adj.


n, pl -lae (-liː)
1. (Biology) biology
a. the central part of the spore-producing body of some fungi and mosses
b. any similar columnar structure
2. (Zoology) Also called: columella auris a small rodlike bone in the middle ear of frogs, reptiles, and birds that transmits sound to the inner ear: homologous to the mammalian stapes
[C16: from Latin: diminutive of columna column]
ˌcoluˈmellar adj


(ˌkɒl yəˈmɛl ə)

n., pl. -mel•lae (-ˈmɛl i)
1. any of various small, columnlike structures of animals or plants; rod or axis.
2. the middle ear bone of amphibians, reptiles, and birds.
[1575–85; < Latin, diminutive of columna column; see -elle]
col`u•mel′lar, adj.
col`u•mel′late (-ɪt, -eɪt) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.columella - a small column (or structure resembling a column) that is a part of a plant or animal
pillar, tower, column - anything that approximates the shape of a column or tower; "the test tube held a column of white powder"; "a tower of dust rose above the horizon"; "a thin pillar of smoke betrayed their campsite"
References in periodicals archive ?
Loss of saccate pollen: the only likely vestige of this in flowering plants is the tectate- columellate or alveolate exine, the site for proteins involved in the cell recognition system.
The pollen of the genera of Nassauvieae is tricolporate, microechinate with few developed microspines, the exine distinctly bilayered, and both the ectosexine and the endosexine clearly columellate (Crisci, 1974a) (see 109B of Figs.
The ectosexine and the endosexine are columellate and they are separated by an internal tectum (clearly distinguishable or not); the nexine is usually thickened at level of aperture.
Exine Mutisia type, microechinate, 7 [micro]m thick at the equator and 4-5 [micro]m thick at the poles, ectosexine slightly columellate.
7 [micro]m thick, ectosexine slightly columellate, slightly thickened at the poles.
The pollen of the Barnadesioideae differs from that of Mutisioideae because the exine is spongy, granulate, granulate--columellate or scarcely columellate and in some genera it is caveate (Urtubey & Telleria, 1998; Zao et al.
The infratectum comprises two indistinct layers, the outer layer columellate, the inner supporting layer spongy, which might indicate the presence of internal foramina (TEM study is needed to determine this with certainty).