Gusset
Gusset , noun
[French gousset armpit, fob, gusset, dim. of gousse pod, husk; compare Italian guscio shell, or Welsh 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.
Seam and gusset and band.
2.
(Armor) Anything resembling a gusset in a garment
(a)
(Armor) A small piece of chain mail at the openings of the joints beneath the arms.
(b)
(Armor) 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.
3.
(Heraldry) An abatement or mark of dishonor in a coat of arms, resembling a gusset.