How many letters does the top answer for “resembling a tortoise shell in appearance or structure; roofed; arched; vaulted.” have?

The most common answer is testudinate (11 letters).

Crossword clue: resembling a tortoise shell in appearance or structure; roofed; arched; vaulted.

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

testudinate 11 letters web-def

Resembling a tortoise shell in appearance or structure; roofed; arched; vaulted.

testudinated 12 letters web-def

Resembling a tortoise shell in appearance or structure; roofed; arched; vaulted.