imperforate

adjective

im·​per·​fo·​rate (ˌ)im-ˈpər-f(ə-)rət  -fə-ˌrāt 

1

: having no opening or aperture

specifically : lacking the usual or normal opening

2

of a stamp or a sheet of stamps : lacking perforations or roulettes

Word History

First Known Use

1657, in the meaning defined at sense 1

Medical Definition

imperforate

adjective

im·​per·​fo·​rate (ˈ)im-ˈpər-f(ə-)rət  -fə-ˌrāt 

: having no opening or aperture

specifically : lacking the usual or normal opening

an imperforate hymen

an imperforate anus