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Definition of Three-quarter sister
1. Noun. (context: horse breeding) The female offspring of a horse's sire/dam that is by/out of a sibling of its other parent.Carol W. Mulder, "[ Correct Terminology]", ''Arabians Today'', 1986 ¹
2. Noun. (context: horse breeding) The female offspring of a horse's dam and a son of its sire.[ AHP Style Guide for Equine Publications] ¹
3. Noun. (context: horse breeding) The female offspring of a horse's sire and a daughter of its dam. ¹
¹ Source: wiktionary.com