Is lancet a word in the Scrabble Dictionary

Yes, lancet is playable

...and is worth 11 points.

Found in the following dictionaries

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

"Lancet" Definition

noun

Architecture A lancet arch.
Architecture A lancet window.
Medicine A surgical knife with a short, wide, pointed double-edged blade, used especially for making punctures and small incisions. Also called lance.
A sharp-pointed and commonly 2-edged surgical instrument used to make small incisions.