Is lumbar a word in the Scrabble Dictionary

Yes, lumbar is playable

...and is worth 14 points.

Found in the following dictionaries

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

"Lumbar" Definition

noun

A lumbar artery, nerve, vertebra, or part.

adjective

Of, near, or situated in the part of the back and sides between the lowest ribs and the pelvis.
Of, relating to, or constituting the loins or the vertebrae between the thoracic vertebrae and sacrum .