plural of connecting rod

Any of a set of coloured rods of different sizes used to teach elementary-school mathematics.

plural of rat rod

A style of hot rod or custom car that imitates or exaggerates the hot rods of the 1940s, 1950s, and 1960s. It is distinct from the "traditional" hot rod, which is an accurate re-creation or period-correct restoration of a hot rod from the same era.

plural of Cuisenaire rod

A graduated staff, typically having alternate black and white sections, used (along with a theodolite) in surveying

(acoustics) Either of a pair of flexible rods whose periods of vibration in two planes at right angles are in some exact ratio to one another. When one end of such a rod is fixed, the free end describes through vibration the corresponding Lissajous figure.

plural of tie rod

(fishing) A stand for holding various items of angling equipment while it is in use.

(historical) An old unit of length, equal to 12.36 feet (377.7 cm).