Klingon definitions

(countable) Member of a fictional alien warrior race depicted as having distinctive forehead ridges and a culture based on strict observance of honour, loyalty, and combat.
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An artificial language created by Marc Okrand, first appearing in a Star Trek episode in 1967.
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Origin of klingon

From the Star Trek franchise, purportedly by Gene Roddenberry, named for Lieutenant Wilbur Clingan of the Los Angeles Police Department