Source : Webster's Revised Unabridged Dictionary (1913)

Kissing bug \Kiss"ing bug`\ (Zo["o]l.)
   Any one of several species of blood-sucking, venomous
   Hemiptera that sometimes bite the lip or other parts of the
   human body, causing painful sores, as the cone-nose
   ({Conorhinus sanguisuga}). [U. S.]

Source : WordNet®

kissing bug
     n : large bloodsucking bug [syn: {conenose}, {cone-nosed bug}, {conenose
         bug}, {big bedbug}]