halotechnyn.

/ˈhaləʊtɛkni/Etymology: < French halotechnie (Dict. Acad. 1762), < Greek ἁλο- salt + τεχνή art.
1854 R. G. Mayne (1860) Halotechnia..old term for that branch which treats of salts: halotechny.
Derivatives
1800 9 i. 588 [A school to study] the formation of salts, and the extraction of acids and alkalies..which he calls the halotechnic school.
This entry has not yet been fully updated (first published 1898; most recently modified version published online June 2018).