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ultra British & World English

An extremist

ultra- British & World English

To an extreme degree; very

ultra- English Thesaurus

an ultra-conservative politician

ultra-clean British & World English

Extremely clean

ultra-fine British & World English

Extremely fine in size, texture, composition, etc.

ultra-thin British & World English

Extremely thin

ultra vires British & World English

Beyond one’s legal power or authority

ultra vires New Oxford Dictionary for Writers & Editors

beyond one's legal authority

ultra-careful British & World English

Extremely careful

ultra-modern British & World English

Extremely modern; advanced

ultra-modern English Thesaurus

this computer is a high-performance ultra-modern machine

ne plus ultra British & World English

The perfect or most extreme example of its kind; the ultimate

ultra-fashionable British & World English

Extremely fashionable

ne plus ultra English Thesaurus

jeans were the ne plus ultra of the modish and modern

ne plus ultra New Oxford Dictionary for Writers & Editors

the perfect example of its kind

ultra-high frequency British & World English

A radio frequency in the range 300 to 3,000 MHz

ultracold British & World English

(Of a neutron) having an energy of the order of 10−7 eV or less

ultralight British & World English

Extremely lightweight

ultrashort British & World English

(Of radio waves) having a wavelength significantly shorter than that of the usual short waves, in particular shorter than 10 metres (i.e. of a VHF frequency above 30 MHz)

ultraviolet British & World English

(Of electromagnetic radiation) having a wavelength shorter than that of the violet end of the visible spectrum but longer than that of X-rays

ultracritical British & World English

Extremely critical or judgemental

ultrafiltration British & World English

Filtration using a medium fine enough to retain colloidal particles, viruses, or large molecules

ultraportable British & World English

A type of laptop computer that is very slim and lightweight

ultraconservative British & World English

A person who is extremely conservative in politics or religion

ultramicroscopic British & World English

Too small to be seen by an ordinary optical microscope

ultranationalism British & World English

Extreme nationalism that promotes the interest of one state or people above all others