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 envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous