The word 'strait' entered English in the 14th century from the Old French 'estreit', which itself originated from the Latin 'strictus', the past participle of 'stringere', meaning 'to draw tight, bind, or compress'. This Latin root is also the source of words like 'strict', 'constrict', and 'restrict'. The original sense of 'narrow or tight' was applied both literally to physical spaces, such as a narrow water passage, and figuratively to difficult circumstances. Over time, the figurative use became formalized in the plural form 'straits', specifically denoting a state of hardship or need, while the singular retained the primary geographical meaning.

The word 'strait' is a simplex word derived as a whole from Old French 'estreit', meaning 'narrow, tight, or close'. Its functional role is as a complete lexical root.