From The Collaborative International Dictionary of English v.0.48:
Chasm \Chasm\ (k[a^]z'm), n. [L. chasma, Gr. cha`sma, fr.
chai`nein to gape, to open wide. See Chaos.]
1. A deep opening made by disruption, as a breach in the
earth or a rock; a yawning abyss; a cleft; a fissure.
[1913 Webster]
That deep, romantic chasm which slanted down the
green hill. --Coleridge.
[1913 Webster]
2. A void space; a gap or break, as in ranks of men.
[1913 Webster]
Memory . . . fills up the chasms of thought.
--Addison.
[1913 Webster]