The word for today is…
ancillary (adjective):
1: subordinate, subsidiary
2: auxiliary, supplementary
Source : Merriam -Webster
Etymology : Ancillary comes from the Latin word ancilla, meaning “a female servant,” which also gave us the rarer English word ancilla, meaning “an aid to achieving or mastering something difficult.” While the English ancilla (which made its debut a couple of centuries after ancillary) is unlikely to be encountered except in very specialized contexts (such as philosophy or quantum computing), ancillary picks up on the notion of providing aid or support in a way that supplements something else. In particular, the word often describes something that is in a position of secondary importance, such as the “ancillary products in a company’s line.”
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