What is another word for "parenthesis"?

Roget's Thesaurus (1911) lists these synonyms for "parenthesis": about, abra, absence, abysm, abyss, anastrophe, and, barranca, before, between, bottom, breach, breachy, break, caesura, canon, capsize, cart, chap, chasm, chink, cleft, clove, contraposition, contrariety, contrary, crack, cranny, creek, crevasse, crevice, cut, defile, dike, down, eversion, far, fissure, flaw, frith.