Source : Webster's Revised Unabridged Dictionary (1913)

Singultus \Sin*gul"tus\, n. [L.] (Med.)
   Hiccough.

Source : WordNet®

singultus
     n : (usually plural) the state of having reflex spasms of the
         diaphragm accompanied by a rapid closure of the glottis
         producing an audible sound; sometimes a symptom of
         indigestion; "how do you cure the hiccups?" [syn: {hiccup},
          {hiccough}]