firnfirn linefirst class brickfirst floorfirst invariantfirst momentfirst moment area theoremfirst moment of areafirst plastic hingefish ladderfishplatefishtail bitfissilefissilityfissurationfissurefissure springfissure waterfissuredfissured clayfissured rockfissuringfitfittingfitting boltfixationfixedfixed actionfixed anchorfixed beamfixed bearingfixed bridgefixed delayfixed edgefixed endfixed end actionfixed end beamfixed end momentfixed ground waterfixed lightfixed matterfixed pointfixed supportfixed time signalfixingfixityfixturefjordflagflaggry rock
