noun the jack. ·see 2d jack, 8. (c).
2. tomcod ·noun the kingfish. ·see kingfish (a).
3. tomcod ·noun a small edible american fish (microgadus tomcod) of the codfish family, very abundant in autumn on the atlantic coast of the northen united states;
called also frostfish. ·see ·illust. under frostfish.