The Spanish verb 'rimar' (to rhyme) has its origins in Ancient Greek 'rhythmos', which meant 'rhythm' or 'measured motion'. This Greek word was borrowed into Latin as 'rhythmus', keeping its meaning of 'rhythm'. The Latin term eventually developed into the Spanish noun 'rima' (rhyme), and by adding the common Spanish verb suffix '-ar', the verb 'rimar' was formed to mean 'to rhyme' or 'to make rhymes'.

This etymology shows how the concept evolved from the general idea of measured motion or rhythm in Greek to the more specific notion of rhyming in Spanish, where similar sounds are matched at the ends of words, creating a kind of verbal rhythm.

A simpler and more common related Spanish word is 'rima' (rhyme), which is the noun form from which 'rimar' is derived. While 'rima' refers to the rhyme itself, 'rimar' is the action of creating rhymes or the state of words rhyming with each other.

English speakers can connect 'rimar' to several familiar English words that share the same Greek origin, including 'rhythm', 'rhythmic', and 'rhyme'. While 'rhythm' maintained the broader meaning of the Greek original referring to measured motion or flow, 'rhyme' (like Spanish 'rimar') specialized to refer specifically to matching sounds in words, especially in poetry. The connection between rhythm and rhyme makes sense, as rhyming is one way to create rhythm in language.