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LESSON THIRTEEN

　　ACERB/ACRI acid acidify acidity acidulate acidulous acrimonious acerbic acrid acrimony exacerbate

　　STRING/STRICT string stringency straight strain strait straiten strangle strangulate stress stretch strict strictness stricture astringency constringe constrain constrained constraint constriction constrictive constrictor distress distressful district overstrain restrain restraint restrict restriction restrictive astringent constrict prestigious stringent

　　STRU/STRUCT structure structural construct construction reconstruct reconstruction construe destroy destruct destructible destruction destructive instruct instruction instructive instructor instrument instrumentality misconstrue misconstruction obstruct obstruction obstructive substructure superstructure deconstruction infrastructure construe instrumental

　　PROP/PROPRI proper property proprietor proprietorship appropriation appropriator expropriation impropriety misappropriate misappropriation appropriate expropriate proprietary propriety

　　TORT/TORS torture torturer tortuous tortoise torment torch contort contortion contortionist distort distortion extortion retort tort extort torsion tortuous

　　VIV victual viand vital vitality vitalize vivacity vivid vivify vivisect devitalize revitalize revive revivification reviviscence survive survival survivor convivial revivify vivacious vivisection

　　SERV serve servant service servility serf serfdom sergeant conserve conservancy conservation conservative conservatory deserve disserve disservice observe observance observation observatory preserve preservation preservative reserve reserved reservation reservoir serviceable servile servitude subservient

　　CLUD/CLUS close closet closure conclude conclusion conclusive disclose

　　disclosure enclose exclude exclusion exclusionism exclusive include inclusion

　　inclusive occlude preclusion reclusion reclusive seclude secluded claustrophobia

　　occlusion preclude recluse seclusion