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ultimatum
a final demand with consequences.
ultimo
occurring in the previous month
ultra vires
beyond one's legal power or authority.
ultralight
having almost no weight at all
ultrasonic
Sound waves above human hearing range.
ultrasound
technology using sound waves for detection
ultraviolet
a type of light beyond visible spectrum
Ultron
A fictional villainous robot character.
umbilical
Relating to the tube connecting mother and baby.
umbilical cord
A tube connecting a baby to its mother before birth.
umbrella
a general or inclusive category
umi
A term for ocean or sea in Japanese.
UML
Unified Modeling Language for software design.
umm
A sound made to express hesitation.
ump
An official who calls the plays in sports.
umpire
Official who oversees a game or match.
umpteen
a large, indefinite number of things
unabashed
Not embarrassed or ashamed about something.
unabated
Continuing without reduction in intensity.
unable
lacking the skill or power to do a task
unable to can
Incapable of accomplishing a task.
unabridged
Complete and not shortened; full version.
unacceptable
Not allowed or approved; inappropriate.
unaccompanied
Without anyone else going along.