Definition: noctambulist

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Source: WordNet (r) 1.7 

noctambulist
     n : someone who walks about in their sleep [syn: sleepwalker,
         somnambulist]

Source: Webster's Revised Unabridged Dictionary (1913) 

Noctambulist \Noc*tam"bu*list\, n.
   A somnambulist.