An exposed, roughly vertical expanse of rock

A person who takes part in rock climbing

(music) A genre of rock music typified by elements of theatrical shock value in live performances.

plural of rock crab

Hemigrapsus sexdentatus, a large-eyed marine crab found off the coast of New Zealand, the common rock crab

(simile) Extremely stable physically. / (simile) Extremely reliable.

(mineralogy) The mineral halite. / Coarsely ground common salt.

The sugar maple, Acer saccharum.

(archaeology) A shallow cave-like opening at the base of a bluff or cliff, a frequent location of prehistoric archeological sites.

A particular type of hemoglobin.