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precipitant (adj.)

"falling headlong, rushing hastily downward," 1610s, from Latin praecipitantem, present participle of praecipitare "to throw or dive headlong; be hasty" (see precipitate (v.)). Meaning "rashly hasty" is from 1640s. 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.). Related: Precipitance.

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Definitions of precipitant from WordNet
1
precipitant (n.)
an agent that causes a precipitate to form;
2
precipitant (adj.)
done with very great haste and without due deliberation; "hasty marriage seldom proveth well"- Shakespeare; "hasty makeshifts take the place of planning"- Arthur Geddes;
From wordnet.princeton.edu