20-volume ref.
The crossword clue "20-volume ref." is answered by OED, a 3-letter entry. Used 6 times across 6 distinct years; most recently in 2019; first recorded in 2006. It appears in 3 publications in the xd corpus. Every figure on this page comes from the collection data itself, never from a guess.
The answer
OED
3 letters. See every clue for this answer on the OED answer page.
Used 6 times across 6 distinct years; most recently in 2019; first recorded in 2006. It appears in 3 publications in the xd corpus. Frequency and last-seen figures come from the xd crossword corpus only.
Other clues for OED
Every other clue in this collection answered by OED, most used first.
- British ref. work - used 92 times, most recently in 2026
- Brit. lexicon - used 50 times, most recently in 2026
- Multivolume ref. - used 22 times, most recently in 2025
- Ref. book - used 17 times, most recently in 2002
- U.K. lexicon - used 15 times, most recently in 2023
- Wordsmith's ref. - used 10 times, most recently in 2026
- 20-vol. reference - used 9 times, most recently in 2022
- Multivolume ref. work - used 9 times, most recently in 2024
- UK lexicon - used 8 times, most recently in 2025
- 20-vol. lexicon - used 7 times, most recently in 2026
- Brit. ref. work - used 6 times, most recently in 2006
- Brit. reference work - used 6 times, most recently in 2012
- Massive Brit. lexicon - used 6 times, most recently in 2021
- U.K. reference book - used 6 times, most recently in 2026
- UK reference set - used 6 times, most recently in 2022
Related clues
Clues in this collection 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.
- Pump up the volume - AMP, used 57 times
- Ref - UMP, used 48 times
- Ref. book - ENC, used 39 times
- Baseball ref - UMP, used 17 times
- Ref. work - ENC, used 14 times
- Volume booster - AMP, used 11 times
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