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There are 6 twelve-letter words containing SPIRO

RESPIROMETER	• respirometer n. A device used to measure the rate of respiration of living organisms, such as plants or fish. • respirometer n. An apparatus for supplying air to a diver under water. • RESPIROMETER n. an instrument for measuring and studying respiration.
RESPIROMETRY	• respirometry n. A form of calorimetry that is used to measure the metabolic rate. • RESPIROMETRY n. measurement by respirometer.
SPIROCHAETAL	• spirochaetal adj. Alternative form of spirochetal. • SPIROCHAETAL adj. resulting from spirochaetes, also SPIROCHETAL.
SPIROCHAETES	• spirochaetes n. Plural of spirochaete. • Spirochaetes prop.n. The spirochetes. • spirochætes n. Plural of spirochæte.
SPIROGRAPHIC	• SPIROGRAPHIC adj. relating to a spirograph, an instrument recording movements of breathing.
SPIROMETRIES	• spirometries n. Plural of spirometry. • SPIROMETRY n. the act of measuring the chest capacity by means of a spirometer.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 35 words
Scrabble in French: 4 words
Scrabble in Spanish: 7 words
Scrabble in Italian: 7 words
Scrabble in German: no word
Scrabble in Romanian: 22 words

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