bigeminate
/bʌɪˈdʒɛmɪnət/adjective
1 Botany. 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.
Origin
Mid 18th century; earliest use found in Chambers's Cyclopaedia. From bi- + geminate, in sense 1 after scientific Latin bigeminatus.