How many letters does the top answer for “converted to solid form (as concrete)” have?

The most common answer is hardened (8 letters).

Crossword clue: converted to solid form (as concrete)

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

hardened 8 letters wn-def

converted to solid form (as concrete)

set 3 letters wn-def

put into a certain place or abstract location