Etymology
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yowl (v.)
c. 1200, yuhelen, probably of imitative origin (compare jubilant). Related: Yowled; yowling. The noun is recorded from mid-15c.
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caterwaul (v.)

"disagreeable howling or screeching," like that of a cat in heat, late 14c., caterwrawen, perhaps from Low German katerwaulen "cry like a cat," or formed in English from cater, from Middle Dutch cater "tomcat" + Middle English waul "to yowl," apparently from Old English *wrag, *wrah "angry," of uncertain origin but somehow imitative. Related: Caterwauled; caterwauling. As a noun from 1708.

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jubilant (adj.)
1660s (Milton), from Latin iubilantem (nominative iubilans), present participle of iubilare "to let out whoops," in Christian writers, "to shout for joy," related to iubilum "wild shout," from Proto-Italic *iu, an exclamation of joy that probably was in Proto-Indo-European (cognates: Greek iu, an interjection of amazement, iuge "crying;" Middle High German ju, juch, an exclamation of joy; Dutch juichen, Old Norse yla, English yowl). With ending as in sibilant. Related: Jubilantly.
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