red pimpernel red·pim·per·nel uncommon noun 1. herb with scarlet or white or purple blossoms that close at approach of rainy weather Synonymsscarlet pimpernelred pimpernelpoor man's weatherglassAnagallis arvensis Related words Broader terms pimpernel WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
