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Definition of Estivoautumnal
1. Adjective. (context: mainly US) Variant spelling of '''aestivoautumnal'''. ¹
¹ Source: wiktionary.com
Medical Definition of Estivoautumnal
1. Relating to or occurring in summer and autumn. Origin: L. Aestivus, summer (adj.), + autumnalis, autumnal (05 Mar 2000)