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Definition of Forearm bone
1. Noun. (anatomy) Any of the two bones, i.e. ulna and radius, that make up the skeletal part of the forearm. ¹
2. Noun. (zoology) The ulna or the fused ulna and radius, which may be the sole bone of the forelimb or the strongest bone of the forelimb. ¹
¹ Source: wiktionary.com