Yes, fix is playable
...and is worth 13 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Fix" Definition
noun
A clear determination or understanding: a briefing that gave us a fix on the current situation.
A difficult or embarrassing situation; a predicament. See Synonyms at predicament.
An instance of arranging a special consideration, such as an exemption from a requirement, or an improper or illegal outcome, especially by means of bribery.
Informal Something that repairs or restores; a solution: no easy fix for an intractable problem.
Slang An amount or dose of something craved, especially an intravenous injection of a narcotic.
verb-transitive
Biology To convert (nitrogen) into stable, biologically assimilable compounds.
Computer Science To convert (data) from floating-point notation to fixed-point notation.
Informal To take revenge upon; get even with.
To agree on; arrange: fix a time to meet.
To assign; attribute: fixing the blame.
verb-intransitive
Chiefly Southern U.S. To be on the verge of; to be making preparations for. Used in progressive tenses with the infinitive: We were fixing to leave without you.
To become stable or firm; harden: Fresh plaster will fix in a few hours.
phrasal-verb
Fix up Informal To provide a companion on a date for: fixed me up with an escort at the last minute.
Fix up To improve the appearance or condition of; refurbish.
Fix up To provide; equip.
verb
To make firm, stable, or stationary.
to give a permanent or final form to as.
To change into a stable compound or available form.
To kill, harden, and preserve for microscopic study.
To make the image of (a photographic film) permanent by removing unused salts.
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