[1] : The Collaborative International Dictionary of English v.0.48

expectorate \expec"torate\, 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
see also:
expectorated expectorating pectoral 

[2] : The Collaborative International Dictionary of English v.0.48

expectorate \expec"torate\, v. i.
   to discharge matter from the lungs or throat by hawking and
   spitting; to spit.
   1913 webster

[3] : WordNet (r) 2.0

expectorate
     v 1: clear out the chest and lungs; "this drug expectorates
          quickly" syn: clear out, drive out
     2: discharge phlegm or sputum from the lungs and out of the
        mouth syn: cough up, cough out, spit up, spit out
see also:
clear out drive out cough up cough out spit up spit out 

Expectorate >> E Words
Expectorate, definition of term: Expectorate
expectorate_pag1.html