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treatise [treatises]▼(systematic discourse on some subject)noun[UK: ˈtriː.tɪs] [US: ˈtriː.təs]
natural history▼(treatise)noun[UK: ˈnæt.ʃrəl ˈhɪ.str̩i] [US: ˈnæ.tʃə.rəl hɪ.str̩i]
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