(literary, uncommon, possibly dated, chiefly with the definite article) the underworld

(mineralogy) A trigonal-hexagonal scalenohedral mineral containing chromium, hydrogen, iodine, magnesium, oxygen, potassium, selenium, sodium, and sulfur.

A cooper's tool, consisting of a tanged iron band with folded-back wings, which hold the tanged irregularly dented blade, secured by a wooden wedge pressed between the tangs. / Iron from a croze.

plural of knock-and-talk