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by- (iou)



by- combining form. Also bye-. OE.
[Repr. BY adverb. See also BYE adjective.]
Forming combs. (chiefly with nouns) in adverbial or adjectival relation, with the senses 'beside, past' (bygone, bypass, bystander), 'at or to one side, aside' (by-blow, by-room), 'subsidiary, subordinate' (byname, byplay), 'unfrequented, devious' (byroad, byway), 'incidental, casual, extra' (by-election, by-product), 'underhand, private' (by-end).