MOS·FET (m?s?f?t?)n. A type of semiconductor field effect transistor used in integrated circuit technology that consumes very little power and can be highly miniaturized.[m(etal)-o(xide)-s(emiconductor) f(ield)-e(ffect) t(ransistor).]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.MOSFET (?m?sf?t) n (Electronics) electronics metal-oxide-silicon field-effect transistor; a type of IGFETCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014