Enter a clue or pattern or both:

The Clue

Unpaired, as a chromosome (9 letter answer)

The Answer

UNIVALENT

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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