phonotax
The total sum of a language's phonological or phonotactic rules.
countable, uncommon, uncountable
It is crucial for the phoneme structure of Finnish — traditionally /d/ has not been included in the Finnish phonotax, but it fulfils the criteria of a phoneme (Karlsson, 1983: 66-7).
Where it comes from
A blend of phonotactics + syntax or phonology + syntax.
Adapted from the Wiktionary entry phonotax (CC BY-SA 4.0).