Definition of per- in English:

per-

Syllabification: per-

prefix

2 Chemistry Having the maximum proportion of some element in combination: peroxide perchloric permanganate

Origin

from Latin (see per).

Definition of per- in:

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Word of the day demoralize
Pronunciation: dəˈmôrəˌlīz
verb
cause (someone) to lose confidence or hope; dispirit