loupe

the word 'loupe' entered english in the late 19th century, borrowed directly from the french noun of the same spelling, meaning a magnifying glass used by jewelers. the french term is believed to derive from an old french word for a mass of metal or a gemstone imperfection, which itself may have origins in a frankish or other germanic root related to a lump or mass. the semantic shift from a lump or mass to a magnifying glass is thought to have occurred because early simple lenses were often ground from a globular lump of glass. this etymological journey highlights how a term for a physical form evolved to denote a precise optical tool.

the entire word 'loupe' is a simplex morpheme borrowed from french.