watching people spell some stuff makes me laugh. most often it's "caduceus" and "guillaume".
the caduceus is nothing but a "white" base elite weapon. there is a unique version of it (astreon's iron ward -- also often misspelled) as well as a set version, part of the griswold set. when someone refers to a "caddy" with no word before or after that, they are most likely referring to the set version, and almost definitely the 4-socket version. if there is something before that -- i.e. "hoj caddy" or "beast caddy" then it is referring to the runewords "hand of justice" and "beast" (respectively).
for the longest time, i believed the pronounciation was "cad - ooh - say - uss." apparently it's "cah - dOO - see - uss."