One of the mysteries of the English language finally explained.
A silkworm house.
Mid 19th century; earliest use found in Andrew Ure (1778–1857), chemist. From French magnanerie from magnan silkworm + -erie, probably after Occitan manhanariá sericulture, (by metonymy) silkworm house. In form magnaniere perhaps after Occitan manhanièra silkworm house.
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