How many letters does the top answer for “having only one row or series.” have?

The most common answer is uniserial (9 letters).

Crossword clue: having only one row or series.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

uniserial 9 letters web-def

Having only one row or series.

having only one leaf. 50% similar → unifolliate

having only one nucleus 50% similar → mononuclear, mononucleate

having only one seed. 50% similar → monospermal, monospermous