A half-round file or rasp (being a flat file on one side, and a round file on the other); typically having coarse teeth. / A file of intermediate cut, neither very coarse nor very fine.

simple past tense and past participle of ensheathe

A surname from French.

(medicine) The use of ultrasound to produce diagnostic images of the internal organs of the body, or of a foetus. / The use of ultrasound to form images of underwater structures.