Etymology
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Isaac

masc. proper name, name of a biblical patriarch, from Late Latin, from Greek Isaak, from Hebrew Yitzhaq, literally "he laughs," imperf. of tzahaq "he laughed."

updated on October 10, 2017

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Definitions of Isaac from WordNet

Isaac (n.)
(Old Testament) the second patriarch; son of Abraham and Sarah who was offered by Abraham as a sacrifice to God; father of Jacob and Esau;
From wordnet.princeton.edu, not affiliated with etymonline.