12-letter words containing a, o, u, i
- nucleotidase — a biochemical catalyst that facilitates the process of hydrolyzing or splitting a nucleotide and turning it into a phosphate and a nucleoside
- nugatoriness — Quality of being nugatory.
- obambulation — (obsolete) Wandering about; a casual outing.
- obfuscations — to confuse, bewilder, or stupefy.
- obnubilation — to cloud over; becloud; obscure.
- obscurantism — opposition to the increase and spread of knowledge.
- obscurantist — opposition to the increase and spread of knowledge.
- obscurations — Plural form of obscuration.
- occupational — of or relating to an occupation, trade, or calling: occupational guidance.
- octastichous — relating to a particular coiled distribution of leaves on the stem that is characterized by having eight leaves per coil on the stem
- olap council — (body, standard) A body formed in early 1995 to work on a cross-product API for OLAP. After little success it was replaced by the Analytical Solutions Forum.
- old faithful — one of the best known geysers of Yellowstone National Park.
- old guardism — political conservatism.
- old prussian — a Baltic language extinct since the 17th century. Abbreviation: OPruss.
- oleaginously — In an oleaginous manner.
- oligophagous — (especially of insects) eating only a few types of food.
- oncornavirus — any of various RNA viruses that cause tumors in humans and other animals.
- ophiolatrous — of, relating to, or practising snake-worshipping
- ophiophagous — eating snakes.
- opium addict — someone who is addicted to the dried juice extracted from the unripe seed capsules of the opium poppy
- optoacoustic — relating to the relationship between light and sound
- orange juice — fruit drink: nectar of orange
- orbicularity — The quality of being orbicular.
- orchidaceous — belonging to the plant family Orchidaceae.
- orichalceous — relating to or resembling orichalc
- oriental rug — a rug or carpet woven usually in Asia and characterized by hand-knotted pile.
- original gum — See o.g (def 1).
- orion nebula — a luminous nebula in the constellation Orion, in the center of Orion's sword.
- ornithogalum — any plant of the genus Ornithogalum
- osco-umbrian — a group of languages, usually classified as Italic, that contains Oscan and Umbrian.
- ostentatious — characterized by or given to pretentious or conspicuous show in an attempt to impress others: an ostentatious dresser.
- otacousticon — (now rare) An instrument to aid hearing, such as an ear trumpet or hearing aid.
- out-marriage — a marriage to someone outside one's ethnic group
- outbalancing — Present participle of outbalance.
- outdistanced — Simple past tense and past participle of outdistance.
- outdistances — Third-person singular simple present indicative form of outdistance.
- outfangthief — the right of a lord to try a thief captured within his jurisdiction, regardless of where the thief is from
- outlandishly — In an outlandish manner.
- outmigration — to leave a region, community, etc., to move or settle into a different part of one's country or home territory: People are no longer out-migrating from the South in such large numbers.
- outside lane — the lane on a motorway where overtaking of other vehicles is permitted and vehicles can travel fastest
- outsider art — art produced by untutored artists working by themselves and for themselves
- outspreading — Present participle of outspread.
- outstandings — Outstanding amounts; unpaid debts.
- over-anxious — excessively anxious.
- over-qualify — to provide with proper or necessary skills, knowledge, credentials, etc.; make competent: to qualify oneself for a job.
- overcautious — excessively or unnecessarily cautious: Sometimes it doesn't pay to be overcautious in business.
- overfatigued — excessively fatigued
- overissuance — the act of issuing in excessive amounts
- overmaturity — (of a tree or forest) the state of having ceased to grow or have commercial value
- oversanguine — too optimistic