Etymology
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infirmary (n.)

mid-15c., "sick bay in a monastery," formerly also enfermerie, also firmary, fermery, from Old French enfermerie "hospital" and directly from Medieval Latin infirmaria "a place for the infirm," from Latin infirmus "weak, frail," (see infirm). According to OED, the common name for a public hospital in 18c. England.

updated on November 20, 2015

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Definitions of infirmary from WordNet

infirmary (n.)
a health facility where patients receive treatment;
Synonyms: hospital
From wordnet.princeton.edu, not affiliated with etymonline.