ne·doc·ro·mil (n?-d?k?r?-m?l?)n. An anti-inflammatory drug, C19H15N, used in an inhaler in the form of a sodium salt to treat mild-to-moderate asthma.[ne- (perhaps from 9-ethyl, beginning of the chemical name, referring to the presence of an ethyl group in ninth position) + d(i)- + o(xy)- + shortening and alteration of cromolyn.]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.