word-forming element meaning "old," from Greek presby-, combining form of presbys "elderly, aged," as a noun, "elder, old man," possibly originally "one who leads the cattle," from *pres- "before" (from PIE root *per- (1) "forward," hence "in front of, before, first") + root of bous "cow." Watkins, however, has it from PIE *pres-gwu- "going before," with second element from root *gw-u- "going," a suffixed form of root *gwa- "to come."

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