psychrometer n.

word-forming element meaning "cold, characterized by cold, capable of enduring low temperatures," from Latinized form of Greek psykhros "cold," from psykhrein "blow, make cool or cold," which is perhaps from the same root as yielded psyche.

word-forming element meaning "device or instrument for measuring;" commonly -ometer, occasionally -imeter; from French -mètre, from Greek metron "a measure," from PIE root *me- (2) "to measure."