Chāsm, n.
(kāzm), n. [Lat. chasma, Gr. χάσμα, from χαίνειν, to gape, to open wide.]
Sense 1. A deep opening made by disrupture, as a breach in the earth or a rock; a cleft; a fissure.
“That deep romantic chasm which slanted down the green hill.” Coleridge.
Sense 2. A void space; a gap or break.
Memory . . . fills up the chasms of thought. Addison.