Emily Dickinson Lexicon

EN-VEL'OP, n.

1. A wrapper; an inclosing cover; an integument; as, the envelop of a letter, or of the heart.
2. In fortification, a work of earth, in form of a parapet or of a small rampart with a parapet. Encyc.
3. In botany, a floral envelop is one of the parts of fructification surrounding the stamens and pistils. The envelops are formed of one or more whorls of abnormally developed leaves. Lindley.