WordNet (r) 3.0 (2006):

semiautomatic
    adj 1: partially automatic
    2: (of firearms) capable of automatic loading and firing
       continuously; "an autoloading rifle" [syn: autoloading(a),
       self-loading, semiautomatic]
    n 1: a pistol that is a semiautomatic firearm capable of loading
         and firing continuously [syn: semiautomatic pistol,
         semiautomatic]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "semiautomatic":
   automated, automatic, automatic device, automaton, automatous,
   cybernated, cyborg, mechanical man, robot, self-acting,
   self-active, self-adjusting, self-closing, self-controlled,
   self-cooking, self-directed, self-directing, self-dumping,
   self-governed, self-governing, self-lighting, self-mover,
   self-operative, self-regulative, self-starting, self-winding,
   self-working, spontaneous