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plagal (adj.)
Related entries & more denoting a mode or melody in Gregorian music in which the final is in the middle of the compass instead of at the bottom, 1590s, from Medieval Latin plagalis, from plaga "the plagal mode," probably from plagius, from Medieval Greek plagios "plagal," in classical Greek "oblique," from plagos "side" (from PIE root *plak- (1) "to be flat").
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infallibility (n.)"quality of being incapable of error," 1610s, from Medieval Latin infallibilitas, from infallibilis (see infallible).
Related entries & more sexagesimal (adj.)"pertaining to 60," 1680s, from Medieval Latin sexagesimalis, from Latin sexagesimus "the sixtieth," from sexaginta "sixty."
Related entries & more febrile (adj.)1650s, from Medieval Latin febrilis "pertaining to fever," from Latin febris "a fever" (see fever).
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heterogeneity (n.)1640s, from heterogeneous + -ity, or else from Medieval Latin heterogeneitas, from heterogeneus.
Related entries & more heraldic (adj.)1772, on model of French héraldique (15c.), from Medieval Latin heraldus (see herald).
Related entries & more Ruthenian (adj.)
Related entries & more 1850, of or pertaining to the western Ukrainian people (earlier Ruthene, 1540s), from Medieval Latin Rutheni "the Little Russians," a derivative of Russi (see Russia). For consonant change, compare Medieval Latin Prut(h)eni, from Prussi "Prussians." Another word in the same sense was Russniak.