trigesimal means thirtieth. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From Latin trigesimus (“thirtieth”) + -al (“forming adjectives”).
adj
- Thirtieth.“In the trigesimal year of his reign...”
- Containing thirty of something.“Each month is a roughly trigesimal period.”
noun
- The trigesimal number system; base 30.