plural of building envelope

(architecture) The physical separator between the conditioned and unconditioned environment of a building.

plural of manila envelope

(sometimes capitalized) An oversized envelope made from durable manila paper designed for repeated use in office settings.

plural of window envelope

An envelope with a transparent panel on its front, through which the name and address of the addressee printed on the letter inside can be seen.

plural of stripped-envelope supernova

(astronomy) A supernova whose spectrum lacks, or is highly deficient in, hydrogen lines, and where the star has already blown away its outer hydrogen envelope, having exposed the lower enveloping helium layer, prior to the explosion.

(Nigeria) The prevalence of "brown envelope journalism", i.e. bribing journalists for positive press coverage.

The practice of giving bribes to journalists in exchange for positive press coverage.