The Collaborative International Dictionary
Tantalic
Tantalic \Tan*tal"ic\, a. (Chem.) Of or pertaining to tantalum; derived from, or containing, tantalum; specifically, designating any one of a series of acids analogous to nitric acid and the polyacid compounds of phosphorus.
Wiktionary
tantalic
a. (context chemistry English) Containing pentavalent tantalum.