One of the mysteries of the English language finally explained.
1Botany. Of a leaf: having a petiole that branches dichotomously, especially with a single pair of leaflets on each secondary petiole; biconjugate. Now rare.
2Consisting of or occurring in pairs or two pairs; consisting of two similar parts; (Zoology) (in echinoderms) designating ambulacral pores arranged in two pairs; having such pores.
Mid 18th century; earliest use found in Chambers's Cyclopaedia. From bi- + geminate, in sense 1 after scientific Latin bigeminatus.
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