How many letters does the top answer for “in the form or manner of an amphitheater.” have?

The most common answer is amphitheatrically (17 letters).

Crossword clue: in the form or manner of an amphitheater.

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

amphitheatrically 17 letters web-def

of or related to an amphitheater

in a square form or manner. 50% similar → squarely

in the form or manner of a specter. 50% similar → spectrally