Envelope

kirjekuori

(wrapper for mailing)

kirjekuori

(computing: routing information of an email)

kuori

(something that envelops)

kuori

(bag containing the lifting gas)

kuori

(biology: enclosing structure or cover)

kääre

(something that envelops)

päällys

(something that envelops)

rajakäyrä

(engineering: limits within which a technological system can perform safely and effectively)

vaippa

(geometry: object that is the tangent to a family of objects)

verhokäyrä

(electronics: curve that bounds a set of curves)

verhokäyrä

(music: shape of a sound)