Etymology
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flange (n.)

1680s, "a widening or branching out," of unknown origin, perhaps related to Old French flanche "flank, hip, side," fem. of flanc (see flank (n.)). Meaning "projecting rim, etc., used for strength or guidance" is from 1735. As a verb from 1820.

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Definitions of flange

flange (n.)
a projection used for strength or for attaching to another object;
Synonyms: rim
From wordnet.princeton.edu