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TeachMeFinance.com - explain directrix directrix The term 'directrix' as it applies to the area of basic math can be defined as 'a fixed line perpendicular to the axis of symmetry and that lies the same distance from the vertex as the focus, but in the opposite direction'. Previous 5 Terms: direction of waves direction of wind Directional (deviated) well Directional Drilling Directional Shear Next 5 Terms: Disability Disabled Enrollee Disappearing Solar Filament (DSF) Disaster Disaster payments About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.