Source : Webster's Revised Unabridged Dictionary (1913)

Lab \Lab\, v. i. [Cf. OD. labben to babble.]
   To prate; to gossip; to babble; to blab. [Obs.] --Chaucer.

Lab \Lab\, n.
   A telltale; a prater; a blabber. [Obs.] ``I am no lab.''
   --Chaucer.

Source : WordNet®

lab
     n : a workplace for the conduct of scientific research [syn: {laboratory},
          {research lab}, {research laboratory}, {science lab}, {science
         laboratory}]