名詞 atresia:

1. an abnormal condition in which a normal opening or tube in the body (as the urethra) is closed or absent

a.tre.sia

n.（名詞）
The absence or closure of a normal body orifice or tubular passage such as the anus, intestine, or external ear canal.
（先天性）閉鎖，無(wú)孔：正常的身體孔或管道，如肛門(mén)、腸或外耳道的缺失或閉合
The degeneration and resorption of one or more ovarian follicles before a state of maturity has been reached.
退化：一個(gè)或多個(gè)卵子囊在達(dá)到成熟狀態(tài)之前的退化或消失

來(lái)源：
New Latin
現(xiàn)代拉丁語(yǔ)
Greek a- [not, without] * see a-
希臘語(yǔ) a- [不，沒(méi)有] *參見(jiàn) a-
trôsis [perforation, orifice] * see ter…-
trôsis [孔，洞] *參見(jiàn) ter…-

【引伸】
atresic