En'vel-ōpe or En-vĕl'op, n.

n. [Fr. enveloppe. See supra.]

1. That which envelops, wraps up, encases, or surrounds; a wrapper; a cover; especially, the cover or wrapper of a document, as of a letter.
2. (Astron.) The nebulous covering of the head or nucleus of a comet; — called also coma.
3. (Fort.) A mound of earth, raised to cover some weak part of the works. Brande.

☞ This word, in the orthography envelope, often has a semi-French pronunciation, ŏng've-lŏp', or ŏng've-lŏp'.