Word Unit: febri-, febr- + (Latin: fever)
Word Unit: febril-, febrill- + (Latin: a minute fiber or filament; often a component of a compound fiber)
Word Unit: feco-, fec-, faeco-, faec-, feci- + (Latin: excrement, dung; from faeces, plural of faex, "dregs, sediment")
Word Unit: fecund- (Latin: fruitful, fruitfulness; fertile, fertility)
Word Unit: feli-, felin-, felino- (Latin: cat, cats)

Cross references of word families that are related directly, or indirectly, to: "cat, cats": aeluro-, eluro-; cat; galeo-; gato-.

Word Unit: felici-, felicit- (Latin: happy, fortunate)
Word Unit: fellat- (Latin: suck, to suck)
Word Unit: fem-, femi- (Latin: woman, women; not masculine: neither man nor men)

Related "woman, female" units: anilo-; gyno-; mulie-; virgo-.

Word Unit: femto- [FEM toh] (Danish and Norwegian: fifteen; a decimal prefix used in the international metric system for measurements)

Related "metric" families: yotta; zetta; exa; peta; tera; giga; mega; kilo; hecto; deka; deci; centi; milli; micro; nano; pico; atto; zepto; yocto.

Word Unit: femur-, femuro- (Latin: thigh)
Word Unit: -fend, fend-, fen- (Latin: ward off, to ward off, strike, keep off, guard, protect; from fendere [found only in compounded words])
Word Unit: fenestra-, fenestr- (Latin: window; in anatomy, a small opening in a bone; to bring to light, to show)

A cross reference of other word family units that are related directly, indirectly, or partially with: "opening, hole, cavity, tract, tube": alveolo-; antro-; anu-; celo-; coelio-; concho-; fenestra-; hernio-; hiat-; meato-; ora-; parieto-; poro-; pyl-, pyle-; pylor-; sphinctero-; splanchn-; stomato-; syringo-; uretero-; urethro-; vagino-; ventricul-.

Word Unit: -fer, -ferous (Latin: to bear, to carry; to produce; to bring)

Cross references of word families related to "bear, carry, bring": duc-; ger-; later-, -lation; phoro-; port-.

Word Unit: ferment-, fermento- (Latin: yeast; substance containing enzymes that break down carbohydrates; from the Latin root of fervere, "to boil, to seethe")
Word Unit: ferro-, ferr-, ferri- (Latin: iron; pertaining to, or containing iron)
Word Unit: ferv- (Latin: to boil; hot; to begin to boil, to be hot; deeply earnest; ardent)

Related "heat, hot" word units: pyreto-; thermo-.

Related "bubble" word unit: ebulli-.

Word Unit: fest-, -fest (Latin: seize, to be seized; capable of being seized)
Word Unit: feto-, fet-, feti-, foeto-, foet- + (Latin: an unborn offspring, fetus)

Related "birth, born, childbirth, offspring" words: abort-; lochio-; nasc-, nat-; proli-; toco-, toko-.

Word Unit: fibrin-, fibrino- (Latin: an insoluble protein that is an essential part of blood coagulation)
Word Unit: fibro-, fibr-, fiber- + (Latin: fiber [an elongated, threadlike structure]; a combining form denoting a relationship to fibers)