Definition of alchemusie in English:

alchemusie

noun

rare, historical
  • A notional mirror for gathering or collecting sunlight.

Origin

Late 16th century; earliest use found in Robert Parsons (1546–1610), Jesuit. Probably from Middle French alchemusi, of uncertain origin, perhaps from Arabic (although no likely Arabic etymon has been identified), or perhaps a fanciful extension of alchemie.

Pronunciation

alchemusie

/ˌalkəˈmuːzi/