Yes, precipitate is playable
...and is worth 20 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Precipitate" Definition
noun
A product resulting from a process, event, or course of action.
Chemistry A solid or solid phase separated from a solution.
A substance separated from a solution or suspension by chemical or physical change usually as an insoluble or solid.
A product, result, or outcome of some process or action.
verb
To bring about especially .
To cause to separate from or suspension.
To cause (vapor) to condense and fall or deposit.
adjective
Acting with or marked by excessive haste and lack of due deliberation. See Synonyms at impetuous, reckless.
Moving rapidly and heedlessly; speeding headlong.
Occurring suddenly or unexpectedly.
Falling, flowing, or rushing with steep descent.
Exhibiting violent or unwise speed.
verb-intransitive
Chemistry To be separated from a solution as a solid.
Meteorology To condense and fall from the air as rain, snow, sleet, or hail.
To fall or be thrown headlong: an ailing economy that precipitated into ruin despite foreign intervention.
verb-transitive
Chemistry To cause (a solid substance) to be separated from a solution.
Meteorology To cause (water vapor) to condense and fall from the air as rain, snow, sleet, or hail.
To cause to happen, especially suddenly or prematurely. See Synonyms at speed.
To throw from or as if from a great height; hurl downward: "The finest bridge in all Peru broke and precipitated five travelers into the gulf below” ( Thornton Wilder).
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