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Latin
Etymology
Reassignment of Classical Latin ācer from the third declension to the first/second, facilitated by the fact that the nominative singular ācer can itself be taken as a second declension form, initially yielding a paradigm ācer/ācra/ācrum (compare Classical Latin niger/nigra/nigrum 'black').[1] The wide distribution of its descendants across the branches of Romance implies that its presence in the oral language considerably predates its appearance in writing.[1]
^ Walther von Wartburg (1928–2002) “acer”, in Französisches Etymologisches Wörterbuch, volumes 24: Refonte A–Aorte, pages 94–99: “Alle rom. formen beruhen auf einer seit dem 3. jh. im lt. belegten nebenform acrus, die besonders in medizinischen texten vorkommt und über deren bildung Niedermann Neue Jahrb. 1912, 324 gehandelt hat.”