From Middle English masoun, machun, from Anglo-Norman machun, masson, from Old Low Frankish *mattio, from Proto-Germanic *maitōn (compare German obsolete Metz, Steinmetz), from *maitanan (“to cut, hew”) (compare Old High German meizan, East Frisian matje, Old Norse meita), from Proto-Indo-European *mai-d- (“to alter”) (compare Old Lithuanian apmaitinti (“to wound”), Latvian màitât (“to spoil, destroy”)), enlargement of Proto-Indo-European *mei- (“to change, exchange”). More at mean, mutate.
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- Rhymes: -eɪsən
mason (plural masons)
- One whose occupation is to build with stone or brick; also, one who prepares stone for building purposes.
- A member of the fraternity of Freemasons. See Freemason.
Derived terms 
- (transitive) To build stonework or brickwork about, under, in, over, etc.; to construct by masons; -- with a prepositional suffix; as, to mason up a well or terrace; to mason in a kettle or boiler.
- accusative singular of maso