词根词缀：fac-, facil-, fact-, feas-, -feat, -fect, -feit, -facient, -faction, -fic-, -fy, -ficate, -fication

【来源及含义】Latin: to make, to do, to build, to cause, to produce; forming, shaping

【同源单词】Ab officio et beneficio, abortifacient, absorbefacient, absorbifacient, acoustoelectric effect, affair

词根词缀：flect-, flex-

【来源及含义】Latin: bend, bending; curve, curving; turn, turning

【相关词根词缀】 Inter-related cross references involving word units meaning "bend, curve, turn": diversi-; diverticul-; gyro-; meand-; -plex; streph-; stroph-; tors-; tropo-; verg-; vers-; volv-.

【同源单词】anteflect, anteflexion, baroreflex, biflex, chemoreflex, circumflex