n.
Pronunciation: h ī - ' grä-m ə -t ə r
Function: noun
Etymology: probably from French hygromètre, from hygr- + -mètre -meter
Date: 1670
: any of several instruments for measuring the humidity of the atmosphere
– hy · gro · met · ric \ ˌ h ī -gr ə - ' me-trik \ adjective