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Initialism of Texas hold 'em, Omaha eight or better, razz, seven-card stud, and seven card stud eight or better.

Etymology tree Proto-Indo-European *ḱers- Proto-Indo-European *-ós Proto-Indo-European *ḱr̥sós? Proto-Indo-European *h₁wers-? Proto-Indo-European *wers- Proto-Indo-European *-ḗn Proto-Indo-European *wérsēn Proto-Indo-Iranian *(w)ŕ̥šā Proto-Iranian *(w)ŕ̥šāder.? Proto-Germanic *hrussą Proto-West Germanic *hross Old English hors Middle English hors English horse From Middle English hors, horse, ors, from Old English hors (“horse”), from Proto-West Germanic *hors, *hross, from Proto-Germanic *hrussą (“horse”), most likely from Proto-Indo-European *ḱr̥sós (“vehicle”), from Proto-Indo-European *ḱers- (“to run”). Doublet of car and carrus. Cognates Cognate with Scots horse (“horse”), West Frisian hoars (“horse”), Cimbrian ross (“horse”), Dutch hors, ros (“horse”), German Ross, Roß (“horse”), Danish and Norwegian Nynorsk hors (“horse, mare”), Faroese hors, ross (“horse”), Icelandic hross (“horse”), Swedish russ (“horse”); also Cornish karr (“car”), Welsh car (“car; cart, wagon”), Latin currus (“car, chariot; wagon, wain”), Ancient Greek ἐπίκουρος (epíkouros, “aiding, assisting; defending; ally, helper; hireling”), Tocharian A kursär (“vehicle; mile”), Tocharian B kwarsär (“course; path”).

From Middle English horsen, from Old English horsian (“to horse, provide with horses”) and ġehorsian (“to horse, set or mount on a horse, supply with horses”), from the noun (see above).

Unknown; probably originally criminals' cant based on the initial letter of heroin and horse.