资料来源 : Webster's Revised Unabridged Dictionary (1913)

Ectasia \Ec*ta"si*a\, n. [NL. See {Ectasis}.] (Med.)
   A dilatation of a hollow organ or of a canal.

资料来源 : WordNet®

ectasia
     n : dilatation or distension of a hollow organ [syn: {ectasis}]