What does cleft mean?
A cleft is a narrow split, crack, or opening in something solid — most often rock, earth, or tissue. The word appears frequently in geology, where a cleft may be a fissure carved by water or ice in a cliff or mountainside, and in anatomy, where certain natural divisions are described as clefts: a cleft chin has a small groove at its center, and a cleft palate is a congenital gap in the roof of the mouth. Cleft can also function as an adjective meaning simply 'divided into two,' and linguists use it in the term 'cleft sentence' for constructions such as 'It was rain that caused the delay,' which split a statement into two clauses for emphasis. Historically, cleft doubles as the past participle of the verb cleave, meaning to split apart. Slightly formal in register, the word lends precision and vividness to writing about landscape, anatomy, and structure.
A narrow split, crack, or indentation in something solid, especially rock or flesh.
"We sheltered from the storm in a cleft in the granite wall."
Common in geology and anatomy; slightly formal or literary in general prose.
Split or divided into two parts; in linguistics, describing a sentence restructured into two clauses for emphasis (a cleft sentence).
"'It was the storm that felled the tree' is a classic cleft sentence."
Regular plural; used when referring to multiple splits, as in rock formations or anatomical features.
"Erosion opened several deep clefts along the canyon rim."
English once had two verbs spelled 'cleave' — one meaning 'to split apart' and one meaning 'to cling together' — and 'cleft' belongs to the splitting family.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cleft
Cleft derives from the Old English verb clēofan, meaning 'to split or cut apart,' which traces back to the Proto-Germanic root *kleuban. This ancient root also produced the modern English verbs cleave and words such as cliff (via Old English clif), reflecting the shared idea of a split or sheer face in stone. Cleft survives both as a noun for the split itself and as an archaic past participle of cleave.
Related word forms
How cleft is actually used
As a noun, cleft leans slightly formal or literary compared with everyday words like 'crack' or 'gap', and it is especially common in geological and anatomical contexts. The British idiom 'in a cleft stick' means trapped between two equally difficult alternatives.
Easily confused with cleft
Cleave is the verb meaning to split or adhere to something, while cleft is primarily the noun for the resulting split (and also serves as an older past participle of cleave).