imperforate
Concise Oxford English Dictionary © 2008 Oxford University Press:
imperforate /ɪmˈpəːf(ə)rət/
▶adjective
- 1 (of a postage stamp or a block or sheet of stamps) lacking perforations.
- 2 Anatomy & Zoology lacking the normal opening.
'imperforate' also found in these Oxford entries:

