STOCK, STOCKS. 1. In the KJV the bole of a tree was a stock and was worshiped by apostate Israel (Isa.44.19; Jer.2.27; Hos.4.12).
2. In the KJV a family (Lev.25.47; Isa.40.24; Phil.3.5). Children of the stock of Abraham were appealed to by Paul in Antioch (Acts.13.26). Paul was proud of being of the Hebrew stock (Phil.3.5).
3. An instrument of punishment. There were various kinds. One was a mechanism by which the body was twisted into an unnatural position and thus made to endure excruciating agony (Jer.20.2-Jer.20.3). Madmen, posing as prophets, were put on the rack (Jer.29.26). Paul and Silas were put in stocks to make sure they did not escape from prison in Philippi (Acts.16.24).
International Standard Bible Encyclopedia (1915)
stok: In English Versions of the Bible is used for:
(1) The stem of a tree, whether alive (Job 14:8; Isa 40:24) or cut down (Isa 44:19; Wis 14:21). In Jer 2:27; 3:9; Ho 4:12, where the Hebrew has simply `ets, "wood," either meaning is possible (tree-worship? idolatry?). In Jer 10:8 the text is doubtful.
(3) Elsewhere (Job 13:27, etc.) the word refers to an instrument of punishment.