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ultrasonography the use of high-frequency sound waves to image a fetus, internal body structures, or objects that are underwater.
ultrasophisticated combined form of sophisticated.
ultrasound ultrasonic waves as used in medical diagnosis, therapy, and the like.
ultrathin combined form of thin.
ultravacuum combined form of vacuum.
ultraviolence combined form of violence.
ultraviolent combined form of violent.
ultraviolet beyond the violet end of the spectrum of visible light and having a wavelength between that of visible light and x-rays. [3 definitions]
ultravirile combined form of virile.
ultravirility combined form of virility.
ultrawide combined form of wide.
ululate to howl or bay loudly, as a hound. [2 definitions]
Ulysses see Odysseus.
um used to express that one is thinking or considering, and, often, to give oneself more time before speaking, as when trying to think of an answer to a question or when trying to make a decision.
umbel a flower cluster in which flower stalks of nearly uniform length sprout from the same point on the main stem, as in the carrot plant.
umber a natural pigment of iron and manganese oxides, that is yellowish brown, or reddish brown when roasted. [2 definitions]
umbilical of, concerning, or resembling a navel or an umbilical cord. [3 definitions]
umbilical cord a tough, flexible cord that connects the navel of a fetus to the placenta of its mother and that supplies nourishment to, and removes wastes from, the fetus.
umbilicus the central depression on the surface of the abdomen at which the umbilical cord was attached to the fetus; navel. [2 definitions]
umbra a shadow or darkened area. [2 definitions]
umbrage a feeling of offense, irritation, or resentment (usu. prec. by take).