JACK, key of a virginal.
JACOB'S STAFF, an instrument for taking altitudes and distances.
JADE, befool.
JEALOUSY, JEALOUS, suspicion, suspicious.
JERKING, lashing.
JEW'S TRUMP, Jew's harp.
JIG, merry ballad or tune; a fanciful dialogue or light comic act introduced at the end or during an interlude of a play.
JOINED (JOINT)-STOOL, folding stool.
JOLL, jowl.
JOLTHEAD, blockhead.