precipitant (adj.)

"falling headlong, rushing hastily downward," 1610s, from Latin precipitantem, present participle of praecipitare (see precipitate (v.)). As a noun in chemistry, "an agent which when added to a solution separates something dissolved and causes it to precipitate or fall to the bottom," from 1680s. The adjective senses now are taken by precipitate (adj.).

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