'vesicular' originates from Latin, specifically the word 'vesicula,' where 'vesicula' is a diminutive of 'vesica' meaning 'bladder' or 'blister.'

'vesicula' transformed into the Medieval Latin 'vesicularis,' and eventually became the modern English word 'vesicular.'

Initially, it meant 'pertaining to a small bladder or blister,' and over time it evolved into its current meaning of 'relating to or resembling vesicles, especially in biological contexts.'