The Spanish word 'espagueti' comes from Italian 'spaghetti', which is the plural form of 'spaghetto', meaning 'small cord'. 'Spaghetto' itself was formed by combining the Italian word 'spago' (meaning 'cord' or 'string') with the diminutive suffix '-etto'. When the word was borrowed into Spanish, a prosthetic 'e-' was added at the beginning, as Spanish typically avoids words beginning with 's' followed by a consonant.

A common pattern in Spanish is adding an 'e-' before words beginning with 's' plus consonant when borrowed from other languages. You can see this in many Spanish words like 'escuela' (from Latin 'schola'), 'espacio' (from Latin 'spatium'), and 'estudio' (from Latin 'studium'). This same pattern was applied to create 'espagueti' from Italian 'spaghetti'.

English speakers will recognize this word easily as it's very similar to the English word 'spaghetti', which was also borrowed from Italian. Both Spanish 'espagueti' and English 'spaghetti' maintain their original meaning referring to the long, thin pasta, though Spanish adapted the spelling and pronunciation to better fit its sound system.