Strong's #5465: cad (pronounced sad)
from an unused root meaning to estop; the stocks:--stocks.
Brown-Driver-Briggs Hebrew Lexicon:
sad
1) stocks (for feet)
Part of Speech: noun masculine
Relation: from an unused root meaning to estop
Usage:
This word is used 2 times:
Job 13:27: "Thou puttest my feet also in the stocks, and lookest narrowly unto all my paths; thou settest a print upon"
Job 33:11: "He putteth my feet in the stocks, he marketh all my paths."