subcollateral
/ˌsʌbkəˈlat(ə)rəl/ /ˌsʌbkəˈlat(ə)r(ə)l/adjective
Anatomy and Zoology. Designating a subdivision of a collateral branch in a structure or system with a branching pattern. rare.
Origin
Mid 17th century; earliest use found in Robert Hooke (1635–1703), natural philosopher. From sub- + collateral.