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Meaning Of Per-
A prefix used to signify through, throughout, by, for, or as an
intensive as perhaps, by hap or chance; perennial, that lasts
throughout the year; perforce, through or by force; perfoliate,
perforate; perspicuous, evident throughout or very evident; perplex,
literally, to entangle very much.
Originally, denoting that the element to the name of which it
is prefixed in the respective compounds exercised its highest valence;
now, only that the element has a higher valence than in other similar
compounds; thus, barium peroxide is the highest oxide of barium; while
nitrogen and manganese peroxides, so-called, are not the highest oxides
of those elements.