foam (noun) foam: bubbles formed from a liquid
Sinonime: bastille, black hole, brig, bullpen, can*, cell, clink, cooler, detention camp, dungeon, house of correction, inside*, jailhouse, joint*,
keep, lockup, pen, penal institution, penitentiary, pound, prison, rack, reformatory, slammer, solitary*, stir*, stockade, up the river