diastema

/dahy-uh-stee-muh/US // ˌdaɪ əˈsti mə //UK // (ˌdaɪəˈstiːmə) //

腹水,腹腔镜,腹膜炎,腹泻

Definitions

n.名词 noun

1
plural di·a·ste·ma·ta [dahy-uh-stee-muh-tuh]. /ˌdaɪ əˈsti mə tə/.
- : 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.

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.