Definition of penta- in English:

penta-

Pronunciation: /ˈpɛntə/

combining form

Five; having five: pentagram pentadactyl

Origin

from Greek pente 'five'.

Definition of penta- in:

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Word of the day anomalous
Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected