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：terri-

【来源及含义】Latin: frightful, fearful; fear; fright; literally, causing terror

【相关描述】Don't confuse this element with other words that are spelled in a similar way; such as, terrestrial, territory.

【同源单词】bioterror, bioterrorism, bioterrorist, deter, deterrent, deterrently