| 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"). |
| umbrella |
a usu. portable or movable shield against the rain or sun, consisting of a collapsible canopy attached to and supported on radiating ribs joined to a central rod or stick. [4 definitions] |
| umbrella bird |
any of several black birds of South and Central America with an umbrellalike crest. |
| umbrella plant |
a grasslike aquatic African plant with a triangular stem crowned by an umbrellalike growth of leaves and green spikelets. |
| umbrella tree |
an American magnolia, having umbrella-shaped clusters of leaves and bearing red fruit and white flowers with an unpleasant odor. [2 definitions] |