space blanket

World English Dictionary
space blanket
 
n
a plastic insulating body wrapping coated on one or both sides with aluminium foil which reflects back most of the body heat lost by radiation: carried by climbers, mountaineers, etc, for use in cases of exposure or exhaustion
 
[C20: material originally developed as part of the US space programme]

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Main Entry:  space blanket
Part of Speech:  n
Definition:  a covering made of an aluminum-coated plastic sheet, designed to retain heat in a person's body, esp. following trauma
Etymology:  1972
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