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The Collaborative International Dictionary
impalla

impala \im*pa"la\, n. An antelope ( Aepyceros melampus) of Southeastern Africa, the male of which has ringed lyre-shaped horns, which curve first backward, then sideways, then upwards. ALso called impalla and pallah.

Wiktionary
impalla

n. (dated form of impala English)

Wikipedia
Impalla