imperforation

adjective

1. Also im·per·fo·rat·ed. not perforate; having no perforation.
2. Philately. (of a number of stamps joined together) lacking the perforations usually separating individual stamps.

noun

3. an imperforate stamp.

adjective

1. not perforated
2. (of a postage stamp) not provided with perforation or any other means of separationAbbreviation: imperf Compare perforate
3. anatomy (of a bodily part, such as the anus) without the normal opening

adj.

1670s, from im- + perforate (adj.).

n.

1. The condition of being abnormally occluded or closed.

adj.

1. Lacking a normal opening.