snark (n.) Look up snark at Dictionary.com
imaginary animal, coined 1876 by Lewis Carroll in "The Hunting of the Snark." In 1950s, name of a type of U.S. cruise missile and in 1980s of a type of sailboat. Meaning "caustic, opinionated, critical rhetoric" is from c.2002 (see snarky) and not directly related, if at all.