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nomadize nombles nomenclature nomenklatura nomo-
non troppo Nonsuch Palace nonsymmetric nontransitive nonviolence
NOR circuit noradrenaline Noraid Nord-Pas-de-Calais Nordenskjöld Sea
Norfolk jacket norland norm. normally Norman {1}
North Brabant nose ring nosebag noseband nosegay
Nostradamus nostril nosy parker nota bene notary public
notch effect notebook computer notecase notelet notorious
Notre Dame Notus nougat Nouvelle-Calédonie nuclear-free zone
nucleo- nucleon number nucleoprotein nucleosome nuclide
Nuevo León nuggar Nuku'alofa nullah num.
Numa Pompilius Numantia numberless numdah numeration
numerator nyaff nyctanthous nyctinasty nylons
NZBC O'Connell o'er O'Flaherty O'Higgins
O'Neill O'Toole O. Henry o.g. o.p.
o/c Oahu oak fern Oak-apple Day oak-leaf cluster
oaken Oakland Oakley Oaks obligor
obolus obscure obscurity observant observation car
observatory obstructionist obtect obtemper obverse
occasional table occasionalism occident occidental occipital bone
octopus odd-pinnate oddball odds and ends odds and sods
Odessa odontalgia odontoblast odontoglossum odontoid process
odontolite odontophore odontorhynchous odorimetry odoriphore
OECD Oedipus complex oedometer OEEC oestradiol
ogee arch ogive OHG ohmmeter oidium
Oireachtas Oita olecranon OLG oligaemia
oligarchy oligotrophic olive drab Olsztyn onion weed
onomatopoeia ONZ opinionated oppidan opposite prompt
opposite sex oppressive opprobrious opsimath optic thalamus
optical density Opus Dei opuscule ordinance ordinand
ordinarily Ordinary level Orenburg organ of Corti organ-grinder

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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"