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Webster 1913 Edition

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Noun.

[Heb.

mámzēr

A person born of relations between whom marriage was forbidden by the Mosaic law; a bastard.

Deut. xxiii. 2 (Douay version).

mamzer ‎(plural mamzers or mamzerim)

a child who is born out of wedlock, from an incestuous or adulterous relationship or from parents of different faiths; a bastard
a contemptible person, a jerk