(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
"According to tradition, Isaac is the biblical figure born to Abraham and Sarah whom he nearly sacrificed before being spared."
The son of Abraham and Sarah, father of Esau and Jacob, from whom the Hebrew people trace their descent.
"According to biblical tradition, Isaac was the beloved son of Abraham and Sarah who became the ancestor of the Israelites through his sons Esau and Jacob."
The name Isaac comes from the Hebrew word for "he laughs," which refers to his mother Sarah's laughter upon being told she would bear a son in her old age. This term traveled into English through Latin and Greek before appearing in Middle English as Ysaac.