We found one dictionary that defines the word undevicesimal:

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1. undevicesimal: Wiktionary

Definitions from Wiktionary (undevicesimal) ▸ adjective:  Based upon the number nineteen. ▸ Words similar to undevicesimal ▸ Usage examples for undevicesimal ▸ Idioms related to undevicesimal ▸ Wikipedia articles (New!) ▸ Popular nouns described by undevicesimal ▸ Words that often appear near undevicesimal ▸ Rhymes of undevicesimal ▸ Invented words related to undevicesimal