[ ˌdʌɪə'sti:mə , dʌɪ'astɪmə ]
■ noun ( plural ~ta )
1》 Zoology a space separating teeth of different functions, especially that between the biting teeth and grinding teeth in rodents and ungulates.
2》 a gap between a person's two upper front teeth.
Origin
C19: via late L. from Gk diastēma 'space between'.