Is limbo a word in the Scrabble Dictionary

Yes, limbo 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)

"Limbo" Definition

noun

A region or condition of oblivion or neglect: Management kept her promotion in limbo for months.
A state or place of confinement.
A West Indian dance in which the dancers keep bending over backward and passing under a pole that is lowered slightly each time.
An intermediate place or state.
Roman Catholic Church The abode of unbaptized but innocent or righteous souls, as those of infants or virtuous individuals who lived before the coming of Christ.

verb

Perform the limbo:.