Reference bk.
The crossword clue "Reference bk." is answered by ENC, a 3-letter entry. Used 6 times across 6 distinct years; most recently in 2025; first recorded in 1977. 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
ENC
3 letters. See every clue for this answer on the ENC answer page.
Used 6 times across 6 distinct years; most recently in 2025; first recorded in 1977. It appears in 3 publications in the xd corpus. Frequency and last-seen figures come from the xd crossword corpus only.
Other answers for this clue
The same clue has also been answered these ways in the xd corpus. Answers inside this collection link to their own answer page.
- ENCYC (1 uses in xd)
Other clues for ENC
Every other clue in this collection answered by ENC, most used first.
- SASE, e.g. - used 92 times, most recently in 2026
- Business letter abbr. - used 45 times, most recently in 2025
- Ref. book - used 39 times, most recently in 2025
- Env. insert - used 25 times, most recently in 2024
- Letter abbr. - used 20 times, most recently in 2024
- Ref. work - used 14 times, most recently in 2013
- Bus. letter abbr. - used 12 times, most recently in 2024
- Env. contents - used 11 times, most recently in 2024
- Env. insertion - used 11 times, most recently in 2025
- Bottom-of-letter abbr. - used 10 times, most recently in 2017
- RSVP card, e.g. - used 10 times, most recently in 2026
- Env. extra - used 9 times, most recently in 2021
- SASE, often - used 8 times, most recently in 2017
- Env. stuffer - used 6 times, most recently in 2003
- Envelope abbr. - used 6 times, most recently in 2024
- SASE, for example - used 6 times, most recently in 2008
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.
- 20-vol. reference - OED, used 9 times
- Navigator's reference - MAP, used 7 times
- Brit. reference work - OED, used 6 times
- Cross-reference word - SEE, used 6 times
- Ship reference - SHE, used 6 times
- U.K. reference book - OED, used 6 times
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