Sir __ Newton
The crossword clue "Sir __ Newton" is answered by ISAAC, a 5-letter entry. Used 104 times across 28 distinct years; most recently in 2026; first recorded in 1944. It appears in 14 publications in the xd corpus. Every figure on this page comes from the pilot data itself.
The answer
ISAAC
5 letters. See every clue for this answer on the ISAAC answer page.
Used 104 times across 28 distinct years; most recently in 2026; first recorded in 1944. It appears in 14 publications in the xd corpus. Frequency and last-seen figures come from the xd crossword corpus only.
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.
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