What is another word for "mortmain"?

Roget's Thesaurus (1911) lists these synonyms for "mortmain": back, bird, bond, captive, clench, clinch, close, clutch, custody, detain, detention, entail, fast, finger, firm, fist, forceps, grasp, grip, gripe, ground, hand, have, hold, hook, hug, husband, inalienable, incommunicable, iron, keep, nail, neaf, neif, nippers, own, paw, pincers, pliers, possess.