noun

• Any of the large, hairy New World spiders comprising the family Theraphosidae.
• (by extension) A member of certain other groups of spiders, generally characterized by large size, hairiness, or membership of infraorder Mygalomorphae to which Theraphosidae family also belongs.
• (dated) A species of wolf spider, Lycosa tarantula, native to southern Europe, the mildly poisonous bite of which was once thought to cause an extreme urge to dance (tarantism).