Enter a clue or pattern or both:
The Clue
Arsenic or silicon (9 letter answer)
The Answer
METALLOID
Tags
Notes
The answer METALLOID is so rare that it appears less than once every 2500 puzzles.
Definition
METALLOID as an adjective:
1. of or being a nonmetallic element that has some of the properties of metal; "arsenic is a metalloid element"