Earth-friendly prefix
The crossword clue "Earth-friendly prefix" is answered by ECO, a 3-letter entry. Used 181 times across 28 distinct years; most recently in 2026. It appears in 20 publications in the xd corpus. Every figure on this page comes from the pilot data itself.
The answer
ECO
3 letters. See every clue for this answer on the ECO answer page.
Used 181 times across 28 distinct years; most recently in 2026. It appears in 20 publications in the xd corpus. Frequency and last-seen figures come from the xd crossword corpus only.
Other clues for ECO
Every other clue in this pilot answered by ECO, most used first.
- Green prefix - used 431 times, most recently in 2026
- Author Umberto - used 184 times, most recently in 2026
- Environmental prefix - used 114 times, most recently in 2026
- "The Name of the Rose" author - used 77 times, most recently in 2025
Related clues
Pilot clues of the same answer length that share a word with this clue, or match its answer pattern when no word is shared. Most used first.
- Prefix with center - EPI, used 134 times
- Equal: Prefix - ISO, used 123 times
- Recent: Prefix - NEO, used 120 times
- Prefix with natal - NEO, used 100 times
- Prefix meaning "three" - TRI, used 91 times
- Earth Day mo. - APR, used 86 times
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