Noun
cleanth (uncountable)
(rare, nonstandard) The condition or state of being clean; cleanliness
The New Critics became very interested in Faulkner's work, with Cleanth Brooks writing The Yoknapatawpha Country and Michael Millgate writing The Achievement of William Faulkner. Source: Internet
He founded the influential literary journal The Southern Review with Cleanth Brooks in 1935. Source: Internet