Imperforated a. : Not perforated; having no opening or aperture.

Example:
how can the menstrual blood come out?

Taxonomy
Webster's New World College Dictionary, yourdictionary, perâ, foÂ, ²Â, pronunciation, word list, dictionary, online dictionary, postage stamp, thesaurus, websters, synonyms, usage examples, quotes, râ, rÄ, adjective.

Defination from the web:
imperforated from Webster's New World College Dictionary. Meaning of imperforated. Pronunciation of imperforated. Definition of the word imperforated. ... lacking the normal opening. Also imperforated im·per′·fo·rat′ed. Etymology: < in- + perforate. noun. an ...