Main Entry: ple·num
Pronunciation: \ˈple-nəm, ˈplē-\
Function: noun
Etymology: New Latin, from Latin, neuter of plenus
Date: 1678
1 a : a space or all space every part of which is full of matter b : an air-filled space in a structure; especially : one that receives air from a blower for distribution (as in a ventilation system)
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