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bona fide

genuine, real

diffidence

modest or shy because of lack of self-confidence

fig

form, shape

effigy

a sculpture or model of a person

finitude

the state of having limits or bounds

finite

having limits or bounds

finis

the end of something

firm

secure

firmware

permanent software programmed into read only memory

flect, flex

bend

deflect

to cause something to change direction

flu, flux

flow

superfluous

unnecessary through being more than enough

fluxion

the action or process of flowing

fract, frag

break

refract

to make a ray of light change direction when it enters at an angle

diffract

to spread out a beam of light by passing through a narrow aperture or across an edge

frat, frater

brother

fraternal

of or like a brother

fratricide

the killing of one's sibling

fraternize

to associate or form a friendship with someone

frictional

of or produced by the action of rubbing two surfaces together

funct

perform

perfunctory

carried out with a minimum of effort of reflection

centrifuge

a machine with a rapidly rotating container that separates fluids of different densities

profuse

exuberantly plentiful

infusion

the introduction of a new element into something

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