The off-white, crystal-like form of crack cocaine.

(informal) The species of diatom, Didymosphenia geminata, best known as widely invasive algae.

(US) A form of confectionery made by crystallizing sugar around a string.

White or brown sugar that has been crystallized into chunks.

Alternative spelling of rockstar

(music) Any of various genres of rock music that feature electronic synthesisers.

(simile) Extremely thick and heavy, so as to make it impossible to move. / (simile, of a person) Very reliable and dependable

(music) Any of several genres of rock music featuring electronic synthesizers

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

Alternative spelling of rockbun