adj. Steep, like a precipice; as, a precipitous cliff or mountain. adj. Headlong; as, precipitous fall. adj. Hasty; rash; quick; sudden; precipitate; as, precipitous attempts. from the GNU version of the Collaborative International Dictionary of English. adj. Steep, like a precipice. adj. Headlong. adj. Hasty; rash; quick; sudden; precipitate.
A'a' lava flow burying a road on Etna (Oct. 2002). Brief explanation: A'a' lava is the most common appearance type of lava flows that cool down forming fragmented, rough, sometimes spiny, or blocky surfaces.
Top definition. lava. Lava is molten rock that originated from the mantle of a planet. Usually extracted through volcanos either on land or underneath water. Not to be confused with magma, which is molten rock that is still under the planets surface. Magma turns into lava after it erupts onto the surface.