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The Collaborative International Dictionary
Praecornua

Praecornu \Pr[ae]*cor"nu\, n.; pl. Pr[ae]cornua. [NL. See Pre-, and Cornu.] (Anat.) The anterior horn of each lateral ventricle of the brain.
--B. G. Wilder.

Wiktionary
praecornua

n. (plural of praecornu English)