swamp cypress swamp·cyp·ress uncommon noun 1. common cypress of southeastern United States having trunk expanded at base; found in coastal swamps and flooding river bottoms Synonymsbald cypressswamp cypresspond bald cypresssouthern cypressTaxodium distichum Related words Broader terms cypress Parts Taxodium WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.