Real Dictionary

flange
countable noun: A flange is a projecting edge on an object. Its purpose is to strengthen the object or to connect it to another object.

flange in American English
a projecting rim or collar on a wheel, pipe, rail, etc., that serves to hold it in place, give it strength, guide it, or attach it to something else
to put a flange on
intransitive verb: to project like, or take the form of, a flange
noun: a projecting rim, collar, or ring on a shaft, pipe, machine housing, etc., cast or formed to give additional strength, stiffness, or supporting area, or to provide a place for the attachment of other objects

flange in British English
noun: a projecting disc-shaped collar or rim on an object for locating or strengthening it or for attaching it to another object
verb: to attach or provide (a component) with a flange

flange in Chemical Engineering
noun: A flange is a flat plate used for connecting two pieces of pipe.

flange in Mechanical Engineering
noun: A flange is a part or edge that sticks out from an object in order to keep the object in position, strengthen it, or attach it to another object.