envelope

• n. envelope, wrapper; envelope; [sky] envelope; envelope trace.

envelopeの「包む」「囲む」から。

envelope

envelope: [18] English borrowed envelope from French enveloppe in the sense ‘wrapper’, and more specifically ‘cover for a letter’, at the start of the 18th century. It was a derivative of the verb envelopper ‘wrap’, whose ancestor, envoloper, gave English envelop in the 14th century. As in the case of its first cousin develop, the origin of the verb remains a mystery.

It is a compound formed from the prefix en- ‘in’ and voloper ‘wrap’, but the source of voloper has never been satisfactorily explained. It may come from a hypothetical Celtic base *vol- ‘roll’, but an equally good candidate is late Latin *faluppa ‘husk’, from which come Italian viluppo ‘bundle’ and viluppare ‘wrap’.
=> develop

envelope (n.)

"a wrapper, an enclosing cover," specifically a prepared wrapper for a letter or other paper, 1705, from French enveloppe (13c.), a back-formation from envelopper "to envelop" (see envelop).

1. Return the enclosed Donation Form today in the prepaid envelope provided.

本日、同封の寄付フォームを提供された料金前払い封筒で返送してください。

2.Under the newspaper，atop a sheet of paper，lay an envelope .

新聞の下の1枚の紙に封筒が置いてある。

3.The envelope has been tampered with and then taped shut again.

封筒は手足を動かされ、テープで封をした。

4.Liz picked up the blue envelope and turned it over curiously.

リズは青い封筒を手に取り、好奇心を持って裏返した。

5.He took a largish buff envelope from his pocket.

彼はポケットからかなり大きなベージュ色の封筒を取り出した。