Cell Biology. the modified protoplasm at the equator of a cell, existing before mitotic division.
Dentistry. a space between two teeth, especially a space between a canine and an incisor of the upper jaw into which a lower canine occludes.
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How to use diastema in a sentence
There is always a long diastema separating the incisors from the grinding teeth.
The crowns of all the teeth are equal in height, and there is no diastema—an arrangement found in no living mammal but man.
The diastema in front of the premolars is longer in the living Equidae than in their extinct allies.
In all the others there is a gap or diastema of larger or smaller size between the incisors and canines.
The incisors always have chisel-like edges and persistent pulps, and are separated by a wide diastema from the premolars.
British Dictionary definitions for diastema
an abnormal space, fissure, or cleft in a bodily organ or part
a gap between the teeth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012