The Collaborative International Dictionary of English v.0.48:

Rechabite \Re"chab*ite\ (r[=e]"k[a^]b*[imac]t), n. (Jewish
   Hist.)
   One of the descendants of Jonadab, the son of Rechab, all of
   whom by his injunction abstained from the use of intoxicating
   drinks and even from planting the vine. Jer. xxxv. 2-19.
   Also, in modern times, a member of a certain society of
   abstainers from alcoholic liquors.
   [1913 Webster]