Medical Definition of astragalus
plural astragali \-ˌlī, -ˌlē\play
1: one of the proximal bones of the tarsus of the higher vertebrates—see talus 1
2: the dried root of an Asian herb (Astragalus membranaceus synonym A. propinquus) used especially as an herbal remedy in traditional Chinese medicine; also : a preparation or extract of this root
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