名詞 flange:

1. a projection used for strength or for attaching to another object
   同義詞：rim

flange

n.（名詞）
A protruding rim, edge, rib, or collar, as on a wheel or a pipe shaft, used to strengthen an object, hold it in place, or attach it to another object.
凸緣：車輪或管道上突出的邊、緣、肋條或環(huán)圈，用來增加物體強度、固定物體或使某一物體附著在另一物體上

來源：
Possibly variant of flanch [device at the side of an escutcheon]
可能為 flanch的變體 [盾形金屬板側面的裝置]
perhaps from French flanche [feminine of] flanc [side] * see flank
可能源自 法語 flanche [] flanc的陰性詞 [側面] *參見 flank

【引伸】
flange
v.（動詞）