| Answer | Crossword Clue |
|---|---|
| columbium | a rare element of the vanadium group, now more commonly called niobium |
| Answer | Crossword Clue |
|---|---|
| columbium | a rare element of the vanadium group, now more commonly called niobium |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.