We found one dictionary that defines the word submentonian:

General (1 matching dictionary)

1. submentonian: Wiktionary

Definitions from Wiktionary (submentonian) ▸ adjective:  Beneath the chin ▸ Words similar to submentonian ▸ Usage examples for submentonian ▸ Idioms related to submentonian ▸ Wikipedia articles (New!) ▸ Popular nouns described by submentonian ▸ Words that often appear near submentonian ▸ Rhymes of submentonian ▸ Invented words related to submentonian