'Spirometer' definitions:

Definition of 'spirometer'

(from WordNet)
noun
A measuring instrument for measuring the vital capacity of the lungs

Definition of 'Spirometer'

From: GCIDE
  • Spirometer \Spi*rom"e*ter\, n. [L. spirare to breathe + -meter.] An instrument for measuring the vital capacity of the lungs, or the volume of air which can be expelled from the chest after the deepest possible inspiration. Cf. Pneumatometer. [1913 Webster]