'cryometer' definitions:

Definition of 'cryometer'

(from WordNet)
noun
A thermometer designed to measure low temperatures

Definition of 'cryometer'

From: GCIDE
  • cryometer \cry*om"e*ter\, n. [Gr. ? cold, frost + -meter.] (Physics) A thermometer for the measurement of low temperatures, esp. such an instrument containing alcohol or some other liquid of a lower freezing point than mercury. [Webster 1913 Suppl.]