How many letters does the top answer for “of or relating to the didelphia. -- n. one of the didelphia.” have?

The most common answer is didelphian (10 letters).

Crossword clue: of or relating to the didelphia. -- n. one of the didelphia.

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

didelphian 10 letters web-def

Of or relating to the Didelphia. -- n. One of the Didelphia.