belonging to the Fabaceae, an alternative name for the plant family Leguminosae.
Compare legume family.

1720–30; < Neo-Latin Fabace(ae) (Fab(a) the type genus (Latin: bean) + -aceae -aceae) + -ous

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World English Dictionary
fabaceous (fəˈbeɪʃəs)
a less common term for leguminous
[C18: from Late Latin fabāceus of beans, from Latin faba bean]

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Example sentences
Nearly twice as many species occur on fabaceous hosts as on any other host family.
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