proˈminulous,a. [f. L. prōminul-us rather prominent + -ous.] Slightly prominent. 1819G. Samouelle Entomol.Compend. 201 Prominulous eyes.1858Mayne Expos.Lex., Prominulus..applied by Haüy to a crystal having ridges upon its surface, which form a very slight prominence: prominulous.