SUBSID'IARY, adjective [Latin subsidiarius. See Subsidy.] 1. Aiding; assistant; furnishing help. subsidiary troops are troops of one nation hired by another for military service. 2. Furnishing additional supplies; as a subsidiary stream. SUBSID'IARY, noun An assistant; an auxiliary; he or that which contributes aid or additional supplies.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI