‘the external envelope of the swimming pool’

‘Construction of the house commenced on-site on October 14 and the structural envelope was erected in an incredible five days.’

‘Noise, when used with a vocal modulator, traces the envelope of the vocal with wideband noise.’

‘Jacob Bernoulli also discovered a general method to determine evolutes of a curve as the envelope of its circles of curvature.’

‘We looked at it, and it's just a sine wave, an envelope of minimum and maximum, with the width of the wave showing the time in boom vs. the time in recession.’

‘What made it worse was they had not paid enough postage for the weight of paper the envelopes contained.’

‘The soldier would then enclose his ballot and the thrice-signed document in an envelope.’

‘The cell envelope of gram-positive bacteria consists of the cytoplasmic membrane and a cell wall.’

‘The departing viruses therefore have an envelope that can fuse with the membranes of nearby cells, allowing the virus to enter.’

‘the switch itself is a glass envelope filled with rare gases and containing two contacts’

‘The presumption that the glass envelopes of these bulbs function as cutoff filters to remove short wavelength radiation was unsubstantiated.’

‘He led a team of 12 in Glastonbury, which designed and built the balloon envelope and flight platform.’

‘At this time of day, the world is wonderfully peaceful - just the sound of distant burners pushing hot air into the envelopes of nearby balloons and songbirds below.’