1. gusset - Noun
2. gusset - Verb
A small piece of cloth inserted in a garment, for the purpose of strengthening some part or giving it a tapering enlargement.
Anything resembling a gusset in a garment
A small piece of chain mail at the openings of the joints beneath the arms.
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.
An abatement or mark of dishonor in a coat of arms, resembling a gusset.
Source: Webster's dictionaryAs stated in Procter & Gamble's initial 1973 patent for the use of double gussets in a diaper, “The double gusset folded areas tend to readily conform to the thigh portions of the leg of the infant. Source: Internet
Most trusses use gusset plates to connect intersecting elements. Source: Internet