The Clue
Niels Bohr's subject (4 letter answer)
The Answer
ATOM
Tags
Notes
The answer ATOM is very common and appears about once every 41 puzzles.
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Definition
ATOM as a noun:
1. (physics and chemistry) the smallest component of an element having the chemical properties of the element
2. (atom, molecule, particle, corpuscle, mote, speck) = (nontechnical usage) a tiny piece of anything