A theoretical type of antimatter rocket which uses proton-antiproton fuel, and magnetic rocket funnels to direct the π-on exhaust. The pi meson particles are created by the matter-antimatter annihilation of protons and antiprotons.

Cancer productus, common along the western coast of North America / Grapsus grapsus, common along the western coast of South America

A proposed form of rocket that would use antimatter as direct or indirect propellant

(figuratively) To be isolated from knowledge of current events.

Synonym of uncool.

plural of rocket-propelled grenade

(mycology) Belonging to the family Roccellaceae of fungi.

A rock one keeps and cares for as if it were a pet, often purchased as a novelty item and jokingly treated as having needs like those of a living animal.

plural of red rock crab

plural of cock-of-the-rock