shaggymane shag·gy·mane uncommon noun 1. common edible mushroom having an elongated shaggy white cap and black spores Synonymsshaggy capshaggymane mushroomCoprinus comatus Related words Word family shaggymane mushroom Broader terms agaric Parts Coprinus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.