Wordnet 3.0
NOUN (1)
1.
a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer;
their difference indicates the dryness of the surrounding air;
The Collaborative International Dictionary of English v.0.48:
Psychrometer \Psy*chrom"e*ter\, n. [Gr. psychro`s cold + -meter:
cf. F. psychrom[`e]tre.]
An instrument for measuring the tension of the aqueous vapor
in the atmosphere, being essentially a wet and dry bulb
hygrometer.
[1913 Webster]
WordNet (r) 3.0 (2006):
psychrometer
n 1: a hygrometer consisting of a dry-bulb thermometer and a
wet-bulb thermometer; their difference indicates the
dryness of the surrounding air