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ulotrichaleanRelating to algae of the order Ulotrichales.ultrafunction(mathematics) A type of generalized non-Archimedean functionultramarathonA running race over a distance longer than 42.195 km (26 miles 385 yard), the length of a standard marathon.ultramutation(biology) A very high level of mutationultraplanktonnanoplankton and picoplankton considered as a groupumbelliprenin(organic chemistry) The chromenone derivative 7-[(2E,6E)-3,7,11-trimethyldodeca-2,6,10-trienoxy]chromen-2-oneunacclimationThe condition of being unacclimated, or unused to something.unaffiliationLack of affiliation; the condition of being unaffiliated.unanimitarianOf or pertaining to unanimity.uncelebrationA memorial of something bad.uncompressionAct or process of uncompressing.uncooperationLack of cooperation; failure to cooperate.uncorrelation(uncountable) The condition of being uncorrelateduncultivationAbsence of cultivation; failure to cultivate.undeclaration(computing, programming) The act of undeclaring something previously declared.undeificationThe process of undeifying.undenutritionMisspelling of undernutrition.underambitionThe quality of being underambitious.undercitationInsufficient citation.underclassman(US) A freshman or sophomore in a high school or college or equivalent.underclassmenplural of underclassmanundercoachmanA subordinate coachman.underdilation(surgery) Less than normal dilationunderdilutionInsufficient dilution.undereruption(dentistry) The state of being undererupted, with less of the tooth visible than is normal.underfriction(chiefly attributive) A system for preventing a rollercoaster train from jumping off the track while in violent motion, using additional wheels under the track.underfunction(intransitive) To function inadequately.underguardianA subordinate guardian.underhorsemanA subordinate horseman.underlengthen(transitive) To lengthen too little.undermaintain(transitive) To maintain inadequately; to allow to fall into disrepair.undermountainBeneath a mountain.underreactionA reaction that is inadequate or insufficient.underrestrainTo fail to restrain sufficiently.underrotationinsufficient rotationundersedationinadequate sedationunegalitarianNot egalitarian.unexpectation(obsolete) Absence of expectation; want of foresight.unhousebrokenNot housebroken.unindentationSynonym of dedentation (“reversal of indentation”).uninformationUnwanted, useless, needless, or untrue information; misinformationunintegrationThe quality of being unintegrated; lack of integration.unitarisationAlternative form of unitarization.unitarizationThe act of unitarizing or of being unitarizedunlibertarianNot libertarian.unmethylation(biochemistry) The removal of methyl groups from a previously methylated moleculeunorigination(theology) The property of not having originated, but having always existed.unostentationLack of ostentation.unpreparationunpreparednessunpublicationThe process of unpublishing something.unrecognitionLack of recognition; failure to recognize.unreformation(obsolete) Lack of reformation; state of being unreformed.unreservation(chiefly computing) The undoing or cancellation of a reservation.untermenschenplural of untermenschuntrinitarianNot Trinitarian.upperclassman(US, education) A junior or senior student in a school or college.upperclassmenplural of upperclassmanuralitisationAlternative form of uralitization.uralitization(geology) The change of pyroxene to amphibole by paramorphism.uridylylation(biochemistry) reaction with uridylic aciduroprotectionprotection of the urinary tract