substituend

noun /ˌsʌbˈstɪt͡ʃuənd/

1. A substitute; something that substitutes for another.

   Each substituend SN, it seems, would amount to the same thing as its corresponding UN in SOME not very strained context.

2. A substituendum; something to be substituted or replaced.

   […]but since the substitute y is not treated like the substituend vowel, the option will not prevail.

Where it comes from

Borrowed from Latin substituendus; compare substituendum.

Adapted from the Wiktionary entry substituend (CC BY-SA 4.0).

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