tubocurarine chloride tu·bo·cu·ra·rine chloride (t&oomacr;'bō-ky&oobreve;-rä'rēn', -rĭn, ty&oomacr;'-)
n.
An alkaloid that competes with acetylcholine for myoneural receptors, blocks ganglionic transmission, and releases histamine; it is used to relax skeletal muscles during surgical operations.