Definition of per- in English:

per-

Pronunciation: /pəː, pə/

prefix

1.1Completely; very: perfect perturb
1.2To destruction; to ill effect: perdition pervert
2 Chemistry Having the maximum proportion of some element in combination: peroxide permanganate

Origin

from Latin (see per).

Definition of per- in:

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Word of the day retroflex
Pronunciation: ˈrɛtrə(ʊ)flɛks
adjective
turned backwards