The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
peu-
DEFINITION:
To purify, cleanse. Oldest form *peu2-. Suffixed zero-grade form *p-ro- (< *pu-ro-). pour, pure, purée, purge, Puritan; compurgation, depurate, expurgate, purblind, spurge, from Latin prus, pure, and prgre, to purify (< *pr-igre < *pr-agre;*ag-, to drive; see ag-). (Pokorny 1. peu- 827.)
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-ro- (< *pu
re, to purify (< *p
