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Wordnet 3.0

NOUN (1)

1. a gap or vacant space between two teeth;


The Collaborative International Dictionary of English v.0.48:

Diastema \Di`a*ste"ma\, n. [L. See Diastem.] (Anat.) A vacant space, or gap, esp. between teeth in a jaw. [1913 Webster]
WordNet (r) 3.0 (2006):

diastema n 1: a gap or vacant space between two teeth