seg·re·ga·ble (s?g?r?-g?-b?l)adj.1. Capable of being segregated: segregable items in a budget.2. Genetics Able to undergo segregation: segregable characters.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.