The Spanish word 'dialecto' (meaning 'dialect') comes from Latin 'dialectus', which was borrowed from Ancient Greek 'διάλεκτος' (dialektos) meaning 'manner of speaking' or 'dialect'. The Greek word was formed by combining two elements: 'δια-' (dia-) meaning 'through' and 'λέγω' (lego) meaning 'to speak'. So etymologically, a dialect is a way of speaking 'through' or 'across' a particular region or group.

The Spanish word 'diálogo' (dialogue) shares the same Greek root 'λέγω' (lego, 'to speak'), making it a cousin to 'dialecto'. Both words preserve the 'dia-' prefix, though they developed different meanings - while 'dialecto' refers to a variety of language, 'diálogo' refers to a conversation or exchange between people.

English speakers can easily remember 'dialecto' by connecting it to the English word 'dialect', which comes from the same Greek source. Other related English words include 'dialogue' and 'dialectic', all sharing the Greek elements of 'dia-' (through) and 'lego' (to speak). The connection between these words lies in their reference to different forms of verbal communication or speech.