zy·mol·o·gy (z?-m?l??-j?)n. The scientific study of fermentation.zy?mo·log?ic (-m?-l?j??k), zy?mo·log?i·cal (-?-k?l) adj.zy·mol?o·gist n.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.