plural of bone spur

plural of spur-shell

Any of several species of conical gastropod shells in the family Trochidae and genus Astraea in family Turbinidae, the margin of the shells being toothed somewhat like the rowel of a spur.

plural of spur-wheel

(engineering) A wheel with the cogs on the face of the edge like a spur.

plural of spur cell

plural of spur leather

plural of spur gear

The strap by which the spur is fastened to the foot.

(mechanical engineering) The simplest type of gear, with teeth projecting radially, parallel to its axis.