operatory

Originally from Medieval Latin operātōrium, from a participle of Late Latin operor. The modern senses may be derived independently of the obsolete senses.

operatory (not comparable)

1. (obsolete) effective; practical; operative [16th–17th c.]
2. Of or relating to operations.

operatory (plural operatories)

1. (obsolete) A laboratory. [16th–17th c.]
2. (medicine) A room in which a dentist (or assistant) performs tasks on the patient. [from 20th c.]

• James A. H. Murray [et al.], editors (1884–1928), “Operatory”, in A New English Dictionary on Historical Principles (Oxford English Dictionary), volumes VII (O–P), London: Clarendon Press, →OCLC, page 146, column 1.

• aerotropy