WordNet (r) 3.0 (2006):

thiopental
    n 1: barbiturate that is a hygroscopic powder (trade name
         Pentothal) that is a strong barbiturate that acts rapidly;
         induces a relaxed state when injected as a general
         anesthetic [syn: thiopental, thiopental sodium,
         thiopentobarbital sodium, Pentothal]