-lepsysuff. Fit; seizure: narcolepsy.[New Latin -l?psia, from Greek -l?psi?, from l?psis, seizure, from lambanein, l?p-, to take, seize.]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.-lepsy or sometimes -lepsian combining form (Medicine) indicating a seizure or attack: catalepsy. [from New Latin -lepsia, from Greek, from l?psis a seizure, from lambanein to seize] -leptic adj combining formCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014