Old English siðe, sigði, from Proto-Germanic *segitho "sickle" (source also of Middle Low German segede, Middle Dutch sichte, Old High German segensa, German Sense), from PIE root *sek- "to cut." The sc- spelling crept in early 15c., from influence of Latin scissor "carver, cutter" and scindere "to cut." Compare French scier "saw," a false spelling from sier.
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