preceptor

Founding-era definition · Webster's 1828 American Dictionary

PRECEP'TOR, noun [Latin proeceptor. See Precept.] 1. In a general sense, a teacher; an instructor. 2. In a restricted sense, the teacher of a school; sometimes, the principal teacher of an academy or other seminary.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI

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