Definitions for "Imperforate"
Not perforated; having no opening or aperture.
A stamp printed on sheets without any means of separation.
Refers to stamps without perforations or rouletting between the individual stamps in a pane. The earliest stamps were imperforate by design, but after about 1860 most stamps were perforated. Modern imperforates are usually errors or are produced specifically for sale to stamp collectors.
Keywords:  atretic, closed
atretic; closed.
Keywords:  aperture, opening
Without an opening or aperture.
Keywords:  abnormally, closed
abnormally closed