Etymology
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somniloquy (n.)

talking in one's sleep, 1847, from somni- "sleep" + -loquy, from Latin loqui "to speak" (from PIE root *tolkw- "to speak"). Related: Somniloquence (1814); somniloquent (1804, Coleridge); somniloquist; somniloquous; somniloquize.

updated on May 25, 2017

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Definitions of somniloquy from WordNet

somniloquy (n.)
uttering speech while asleep;
Synonyms: sleep talking / somniloquism
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.