diastema

diastema
[ˌdʌɪəˈstiːmə, dʌɪˈastɪmə]
(pl. diastemata)
  1. a gap between the teeth, in particular
    齿隙,尤指
    ■(Zoology)a space separating teeth of different functions, especially that between the biting teeth (incisors and canines) and grinding teeth (premolars and molars) in rodents and ungulates
    (动)齿隙,牙间隙
    ■a gap between a person's two upper front teeth
    (人的)上门齿间的间隙
语源
  1. mid 19th cent.: via late Latin from Greek diastema space between'
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