Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prōmĭnentĭa, ae, f. [prominens], a jutting out, projection, prominence (postAug.): ita uti summam habeant prominentiam (anterides), Vitr. 6, 11; praecordiorum, Cael. Aur. Acut. 3, 5, 50; in plur. of promontories, Sol. 27, 1.