A precipitant is a cause or reason for some event. So if you skip your Biology test on March 17th, your parents might deduce that your enjoyment of the St. Patrick's Day parade was a precipitant of your actions.

See the pre in precipitant? Since pre means "before," you can remember that a precipitant always comes before something else. Precipitant can also mean "hasty" — a precipitant marriage is one where both parties marry too quickly. Not to be confused with percipient, meaning someone with unusual sensitivity and understanding of people and events. A percipient person would never skip his Biology test.

Definitions of precipitant
  1. adjective
    done with very great haste and without due deliberation
    synonyms: hasty, overhasty, precipitate, precipitous
    moving rapidly or performed quickly or in great haste
  2. noun
    an agent that causes a precipitate to form
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    a compound used in analysis as a precipitant for palladium or nickel
    type of:
    a substance that exerts some force or effect
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