Definition of spiro- in English:

spiro-

Pronunciation: /ˈspʌɪrəʊ/

combining form

Relating to breathing: spirometer

Origin

formed irregularly from Latin spirare 'breathe'.

Definition of spiro- in:

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Word of the day animalcule
Pronunciation: ˌanəˈmalˌkyo͞ol
noun
a microscopic animal