Etymology
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Words related to ventriloquy

ventral (adj.)
1739, from French ventral or directly from Late Latin ventralis "of or pertaining to the belly or stomach," from Latin venter (genitive ventris) "belly, paunch; stomach, appetite; womb, unborn child," from PIE *wend-tri- (source also of Latin vesica "bladder," Sanskrit vastih "bladder," Old High German wanast, German wanst "paunch, belly"), perhaps from root *udero- "abdomen, womb, stomach" (see uterus).
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*tolkw- 
Proto-Indo-European root meaning "to speak."

It forms all or part of: circumlocution; colloquium; colloquy; elocution; eloquence; grandiloquence; interlocution; interlocutor; locution; locutory; loquacious; loquacity; loquitur; magniloquence; magniloquent; obloquy; soliloquy; somniloquy; vaniloquence; ventriloquism; ventriloquy.

It is the hypothetical source of/evidence for its existence is provided by: Latin loqui "to speak;" Old Irish ad-tluch- "to thank," to-tluch- "to ask;" Old Church Slavonic tloko "interpretation, explanation."
ventriloquism (n.)
1773, in the modern sense, from ventriloquy + -ism.
ventriloquist (n.)
1650s in the classical sense, from ventriloquy + -ist. In the modern sense from c. 1800. Ventriloquists in ancient Greece were Pythones, a reference to the Delphic Oracle. Another English word for them was gastromyth.