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From The Collaborative International Dictionary of English v.0.48:
Gusset \Gus"set\, n. [F. gousset armpit, fob, gusset, dim. of gousse pod, husk; cf. It. guscio shell, or W. cwysed gore, gusset.] 1. A small piece of cloth inserted in a garment, for the purpose of strengthening some part or giving it a tapering enlargement. [1913 Webster] Seam and gusset and band. --Hood. [1913 Webster] 2. Anything resembling a gusset in a garment; as: (a) (Armor) A small piece of chain mail at the openings of the joints beneath the arms. (b) (Mach.) A kind of bracket, or angular piece of iron, fastened in the angles of a structure to give strength or stiffness; esp., the part joining the barrel and the fire box of a locomotive boiler. [1913 Webster] 3. (Her.) An abatement or mark of dishonor in a coat of arms, resembling a gusset. [1913 Webster]