J

iudex judge judic- iudex, iūdicis adjudicate, adjudication, adjudicative, adjudicator, adjudicatory, extrajudicial, injudicious, judge, judgement, judgment, judgmental, judicable, judicative, judicator, judicatory, judicature, judicial, judiciary, judicious, nonjudgmental, nonjudicial, prejudge, prejudgment, prejudice, prejudicial, quasijudicial
iungo join jung-, junct- iungo, junctus adjoin, adjoint, adjunct, adjunction, adjunctive, conjoin, conjoint, conjunct, conjunction, conjunctive, disjoin, disjoint, disjunct, disjunction, disjunctive, enjoin, enjoinder, enjoinment, injunction, injunctive, join, junction, juncture, junta, junto, nondisjunction, nonjoinder, rejoin, rejoinder, sejoin, sejungible, subjoin, subjoinder, subjunctive, surrejoinder
ius law, justice jus-, jur- ius, iuris abjure, jurisprudence, jury, just, justice, objurgate, perjury
jaceo lie jac- jaceo to be thrown adjacency, adjacent, circumjacency, circumjacent, ease, easy, interjacent, interjoist, joist, nonadjacent, subjacent, superjacent
jacio  cast, throw jac-, -ject- jacio (also spelled iacio), iectus abject, adjectival, adjective, conjectural, conjecture, deject, dejection, disject, disjection, ejaculate, ejaculation, ejaculatory, eject, ejecta, ejection, ejective, ejectment, ejector, inject, injection, injective, injector, interject, interjection, interjectional, interjector, interjectory, introject, introjection, introjective, jactation, jactitation, jaculate, jaculation, jaculator, jaculatory, jaculiferous, jet, jetsam, jettison, nonobjective, object, objectification, objection, objectionable, objective, objectivity, objector, parget, project, projectile, projection, projective, projector, reject, rejectamenta, rejection, subject, subjection, subjective, subjectivity, subjicible, surjection, surjective, traject, trajectile, trajection, trajectory, trijet
janua door janu- janua janitor, January
jocus  jest joc- jocus (also spelled iocus) jewel, jewelry, jocose, jocosity, jocular, jocularity, joke, jongleur, juggle
jugo yoke jug- jugo, jugum conjugal, subjugate
junior younger junior- junior junior, juniority
juvenis young, youth juven- juvenis juvenile, rejuvenate
juvo help juv-, jut- juvo, jutus adjument, adjutant, adjutor, adjutory, adjutrix, coadjutant, coadjutor, injucundity, jocund, jocundity
juxta beside, near juxta- juxta juxtaposition