| ultrasonics |
(used with a sing. verb) the scientific study of ultrasonic sound waves and their use in fields such as medicine. |
| 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] |