Is tulip a word in the Scrabble Dictionary

Yes, tulip 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)

"Tulip" Definition

noun

Any of several bulbous plants of the genus Tulipa, native chiefly to Asia and widely cultivated for their showy, variously colored flowers.
The flower of any of these plants.
Any of a genus () of Eurasian bulbous herbs of the lily family that have linear or broadly lanceolate leaves and are widely grown for their showy flowers.
The flower or bulb of a tulip.