a. Obs. rare1. [irreg. f. L. subsidium SUBSIDY sb. or F. subside SUBSIDE sb.: See -UOUS.] Assisting, subsidiary.
1490. Caxton, Eneydos, xix. 71/29. Ye subsiduous [orig. F. subcide] modre that hath made the to be norysshed wyth the mylke of the tygres of Yrcanye.