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| the first or innermost digit of the foot of humans and other primates or of the hind foot of other mammals; great toe; big toe. |
| the innermost digit of the forelimb; thumb. |
atresia a·tre·sia (ə-trē'zhə, -zhē-ə)
n.
The congenital absence or closure of a normal body orifice or tubular passage such as the anus, intestine, or external ear canal.
The degeneration and resorption of one or more ovarian follicles before maturation.