Enter a clue or pattern or both:
The Clue
Unpaired, as a chromosome (9 letter answer)
The Answer
UNIVALENT
Tags
Notes
The answer UNIVALENT is so rare that it appears less than once every 2500 puzzles.
Definition
UNIVALENT as an adjective:
1. used of a chromosome that is not paired or united with its homologous chromosome during synapsis; "a univalent chromosome"
2. (monovalent, univalent) = having a valence of 1