Dedication: 3/15/05

fulcio, fultum: hold up. support

efulcrate, fulcrum

fulg(e)o: shine, gleam; fulgor: brightness; fulmen (lightening)

effulge, effulgence, effulgent, foudroyant, fulgarite, fulgent, fulgurant, fulgurous, fulminant, fulminate, fulmination, fulminator, refulgent, subfulgent

fuligo: soot

fuliginous

fullo: cleaner

defile (vb), defilement, defiler, foil (vb), foilist, fuller

fulvus: tawny

fulvous, griseofulvin

fumus: smoke

fume, fumerole, fumigate, fumigation, fumigator, fumose, fumous, fumulus, fumy, perfume, perfumeless, perfumer, perfumery, sfumato (It), suffumigate

fundo, fusum: pour out

affusion, circumfuse, circumfusion, confound, confoundedly, confounder, confoundingly, confusability, confusable, confuably, confuse, confusedly, confusedness, confusible, confusingly, confusion, confusional, defuse, defusion, diffusate, diffuse, diffusedly, diffusely, diffuseness, diffuser, diffusibility, diffusible, diffusiometer, diffusion, diffusional, diffusionism, diffusionist, diffusive, diffusively, diffusiveness, diffusivity, dumbfound, effund, effuse, effusion, effusive, effusively, fondant, fondue, font (type), found (melt), foundry, fount (type), funnel, fuse (vb), fusibility, fusible, fusion, fusional, fusionalism, fusionalist, futile, futilely, futilitarian, futility, humifuse, immunodiffusion, infundibular, infundibulate, infundibuliform, infundibulum, infuse, infuser, infusibility, infusible, infusion, infusionism, infusionist, infusive, infusor, infusorial, infusory, interdiffuse, interfuse, interfusion, intrafusal, microdiffusion, nuclear fusion, perfusate, perfuse, perfusion, perfusionist, perfusive, perifusate, perifuse, perifusion, profuse, profusely, profuseness, profusion, profusive, profusively, rediffusion, refund, stimulus diffusion, suffuse, suffusion, suffusive, superfuse, superfusion, surfuse, thermal diffusion, thermodiffusion, transfuse, transfusion, transfusive

OED associates refute etc. with fundo; others cite foveo.
fundus: bottom

co-founder, defund, de profundis, found (originate), foundation, foudational foundationless, founder, founding, foundling, foundress, fund, fundable, fundament, fundamental, fundamentalism, fundamentalist, fundamentality, fundamentally, fund-raising, humifuse, ill-founded, latifundium, newfound, Newfoundland, overfunded, profound, profoundly, profoundness, profundity, underfunded, underfunding, unfounded, unfunded, well-founded