Spirometer

spī-rom′e-tėr, n. an instrument for measuring the capacity of the lungs, or the quantity of air that one can breathe out after a forced inspiration.— n. Spī′rograph , an instrument for marking down the breathing movement.— adj. Spīromet′ric .— ns. Spīrom′etry ; Spī′rophore , an apparatus for inducing artificial respiration by means of an air-tight case for the body and an air-pump; Spīroph′yton , a genus of fo il algæ found in the Devonian in New York state; Spīrozō′oid , the filamentous defensive zooid of certain hydroids, coiled spirally when not in action. [L. spirāre , to breathe, Gr. metron , a measure.]