cul·lion \ˈkəlyən\noun (-s) Etymology: Middle English coillon, colyoun testicle, from Middle French coillon, couillon, from (assumed) Vulgar Latin coleon-, coleo, from Latin coleus scrotum, perhaps from colum sieve, strainer; from the shape of a straining bag — more at hedge 1.obsolete: testis 2.archaic: a mean or base fellow 3.: orchid 1