Definition of pyro- in English:

pyro-

Pronunciation: /ˈpʌɪrəʊ/

combining form

1Relating to fire: pyromania
2 Chemistry & Mineralogy Denoting a compound or mineral that is formed or affected by heat or has a fiery colour: pyrophosphate pyroxene

Origin

from Greek pur 'fire'.

Definition of pyro- in:

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Pronunciation: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music