How many letters does the top answer for “another word for radar” have?

The most common answer is radiolocation (13 letters).

Crossword clue: another word for radar

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

radiolocation 13 letters gen-syn

measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects

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