The Spanish word 'pepinillo', meaning 'gherkin' or 'small cucumber', has an interesting journey from ancient Greek through Latin. It starts with the Greek word 'pépon' (πέπων), which meant 'ripe' and was particularly used to refer to melons. This word was borrowed into Latin as 'pepo', still referring to melons.

In Spanish, this evolved into 'pepino' meaning 'cucumber'. The final form 'pepinillo' adds the diminutive suffix '-illo' to 'pepino', literally meaning 'little cucumber' - which perfectly describes a gherkin!

The most obvious related Spanish word is 'pepino' (cucumber), which is the base word from which 'pepinillo' is derived. While 'pepino' refers to a full-sized cucumber, 'pepinillo' specifically refers to the smaller pickled variety (gherkins). This is a great example of how Spanish uses diminutive suffixes like '-illo' to create new but related meanings.

While English doesn't have many common words directly related to 'pepinillo', we do use the scientific term 'pepo' in botany to describe fruits like melons, cucumbers, and pumpkins - all related to the original Greek meaning. This scientific term comes from the same Latin word 'pepo' that gave rise to the Spanish 'pepinillo'.