pillbox

the word 'pillbox' is a transparent compound formed from two english words of distinct origins. 'pill' entered english from middle low german or dutch, referring to a small medicinal ball, while 'box' has a classical lineage tracing back to the greek 'pyxis', a container for small objects. the literal combination, a 'box for pills', emerged in the 18th century. its application to a type of military fortification in the early 20th century is a metaphorical extension, drawing a visual analogy between the small, concrete, often cylindrical defensive structure and the shape of a small, portable pill container.

Structure: pill + box pill (from middle english 'pille', likely from middle low german 'pille' or middle dutch 'pille', meaning a small ball or pellet; a medicinal tablet). box (from old english 'box', from late latin 'buxis', from greek 'pyxis', meaning a container).