eka- + boron: the name given by Dmitri Mendeleev to the then undiscovered element at the position of scandium in his periodic table.
- (chemistry) scandium
- 1902 John Charles Hessler, Albert Lincoln Smith - Essentials of Chemistry
- In 1880, Nilson and Cleve discovered in a Scandinavian mineral a new element which had the properties of eka-boron. They called it Scandium.