gasket(n = noun.artifact) - seal consisting of a ring for packing pistons or sealing a pipe joint;
is a kind of seal
has particulars: head gasket, o ring

1.  A line or band used to lash a furled sail securely. Sea gaskets are common lines; harbor gaskets are plaited and decorated lines or bands. Called also casket. [1913 Webster]

2.  The plaited hemp used for packing a piston, as of the steam engine and its pumps. [1913 Webster]

gasket, n.
1 a sheet or ring of rubber etc., shaped to seal the junction of metal surfaces.
2 a small cord securing a furled sail to a yard.

Idiom:
blow a gasket sl. lose one's temper.

Etymology:
perh. f. F garcette thin rope (orig. little girl)

head gasket