Enter a clue or pattern or both:
The Clue
Certain algae (7 letter answer)
The Answer
DIATOMS
Tags
Notes
The answer DIATOMS is so rare that it appears less than once every 2500 puzzles.
Related Clues
Algae
Freshwater algae
Definition
DIATOM as a noun:
1. microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica