snail fevern. See schistosomiasis.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.schis?to?so?mi?a?sis (???s t? so??ma? ? s?s) n. a chronic anemia and organ infection caused by parasitic flukes of the genus Schistosoma, transmitted through feces-contaminated river snails. [1905?10] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.