American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "ff" in a sentence
"So I can now easily launch frequently used applications and documents by pressing Win+R to open the Run Dialog and typing in "ff" for Firefox, "add" for the Add/Remove Control Panel, "doc" for OpenOffice, etc."
"Just know that fff burns faster than ff and thus creates higher pressures. 90 grains of ff is starting to be a heavy load in my .50."
"I refer to the ff coalition as the Fake and Falsehood Coalition."