The Collaborative International Dictionary of English v.0.48:

Expectorate \Ex*pec"to*rate\, v. t. [imp. & p. p.
   Expectorated; p. pr. & vb. n. Expectorating.] [L.
   expecrorare to drive from the breast; ex out + pectus,
   pectiris, breast. See Pectoral.]
   To eject from the trachea or lungs; to discharge, as phlegm
   or other matter, by coughing, hawking, and spitting; to spit
   forth.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Expectorate \Ex*pec"to*rate\, v. i.
   To discharge matter from the lungs or throat by hawking and
   spitting; to spit.
   [1913 Webster]

WordNet (r) 3.0 (2006):

expectorate
    v 1: clear out the chest and lungs; "This drug expectorates
         quickly" [syn: expectorate, clear out, drive out]
    2: discharge (phlegm or sputum) from the lungs and out of the
       mouth [syn: expectorate, cough up, cough out, spit
       up, spit out]