Is flour a word in the Scrabble Dictionary

Yes, flour is playable

...and is worth 10 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Flour" Definition

noun

A fine, powdery foodstuff obtained by grinding and sifting the meal of a grain, especially wheat, used chiefly in baking.
A soft, fine powder.
Any of various similar finely ground or powdered foodstuffs, as of cassava, fish, or bananas.
A product consisting of finely milled wheat.
A similar product made from another grain or food product (as dried potatoes or fish).

verb-transitive

To cover or coat with flour.
To make into flour.

verb

To coat with or as if with flour.
To break up into particles.