Harold Kroto ha·roldk·roto uncommon noun 1. British chemist who with Robert Curl and Richard Smalley discovered fullerenes and opened a new branch of chemistry (bron in 1939) SynonymsKrotoHarold KrotoHarold W. KrotoSir Harold Walter Kroto Related words Broader terms chemist WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.