Definition of Familiar:

part of speech: noun

One long acquainted; a spirit or demon supposed to wait on; an officer or servant of the Inquisition employed to arrest and imprison the accused.

part of speech: adjective

Well acquainted with; intimate; affable; easy and unconstrained; common; frequent.

Usage examples:

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ronde bosse

In arch., a term applied to sculptured objects in their full forms, in contradistinction to those which are in relief, or attached more or less to a plane or ground. ...