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n. pl. di·ath·e·ses (-sēz′)
1. A hereditary predisposition of the body to a disease, a group of diseases, an allergy, or another disorder.
2. Grammar See voice.
[Greek, disposition, condition, from diatithenai, diathe-, to dispose : dia-, dia- + tithenai, to place, set; see dhē- in Indo-European roots.]
di′a·thet′ic (dī′ə-thĕt′ĭk) adj.
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.