Is binary a word in the Scrabble Dictionary

Yes, binary is playable

...and is worth 12 points.

Found in the following dictionaries

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

"Binary" Definition

noun

Something that is binary, especially a binary star.
something made of or based on two things or parts as.
A binary number system.

adjective

Characterized by or consisting of two parts or components; twofold.
Chemistry Consisting of or containing only molecules consisting of two kinds of atoms.
Music Having two sections or subjects.
Of or employing two comparatively nontoxic chemicals that combine to produce a deadly poison: binary weapons; a binary nerve gas.
Of or relating to a system of numeration having 2 as its base.