(engineering) A cam keyed to a rock shaft.

(US, simile) Very stupid; dumb as a post.

A method of improving the fertility of poor soils by adding a layer of small stones atop the soil, with perhaps some fertilizer atop the soil before adding rocks. The added rocks/stones would leech minerals from the rocky layer into the soil and have the stony layer retain moisture in the soil. The layer of stones remains in place when the area is cultivated.

(historical) A rocket for carrying a line from the shore to a ship in distress.

plural of rock cod

Any of several Australian fishes of the genus Lotella

(aviation, slang) A daredevil pilot of great skill.

plural of rocking tree

(weaving) The axle from which the lay of a loom is suspended.

present participle of re-rock