|
|
uranium 235 |
Noun
|
a uranium isotope with mass number 235 |
|
|
uranium 238 |
Noun
|
the commonest isotope of uranium |
|
|
undersoil |
Noun
|
the layer of soil between the topsoil and bedrock |
|
|
urobilin |
Noun
|
brown bile pigment formed from urobilinogens and found in feces and in small amounts in urine |
|
|
urobilinogen |
Noun
|
a chromogen formed in the intestine from the breakdown of bilirubin |
|
|
unsaturated fatty acid |
Noun
|
a fatty acid whose carbon chain can absorb additional hydrogen atoms |
|
|
unslaked lime |
Noun
|
a white crystalline oxide used in the production of calcium hydroxide |
|
|
urine |
Noun
|
liquid excretory product |
|
|
urea-formaldehyde resin |
Noun
|
a clear thermosetting resin made from urea and formaldehyde and used in electrical fittings, adhesives, and finishes |
|
|
urokinase |
Noun
|
protease produced in the kidney that converts plasminogen to plasmin and so initiates fibrinolysis |
|
|
universal solvent |
Noun
|
hypothetical universal solvent once sought by alchemists |
|
|
ubiquinone |
Noun
|
any of several quinones found in living cells and that function as coenzymes that transfer electrons from one molecule to another in cell respiration |
|
|
ultramarine blue |
Noun
|
blue pigment made of powdered lapis lazuli |
|
|
undecylenic acid |
Noun
|
an acid that is a component of perspiration |
|
|
unleaded gasoline |
Noun
|
gasoline that has not been treated with a lead compound |
|
|
unleaded petrol |
Noun
|
gasoline that has not been treated with a lead compound |
|
|
urease |
Noun
|
an enzyme that catalyzes the hydrolysis of urea into carbon dioxide and ammonia |
|
|
urethane |
Noun
|
an ester of carbamic acid |
|
|
uracil |
Noun
|
a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine |
|
|
uraninite |
Noun
|
a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium |
|
|
uranium ore |
Noun
|
any ore from which uranium can be extracted |
|
|
uranyl |
Noun
|
the bivalent radical UO2 which forms salts with acids |
|
|
uranyl group |
Noun
|
the bivalent radical UO2 which forms salts with acids |
|
|
uranyl radical |
Noun
|
the bivalent radical UO2 which forms salts with acids |
|
|
uranyl nitrate |
Noun
|
a yellow salt obtained by the reaction of uranium salts with nitric acid |
|
|
uranyl oxalate |
Noun
|
a salt obtained by the reaction of uranium salts with oxalic acid |
|
|
urea |
Noun
|
the chief solid component of mammalian urine |
|
|
uric acid |
Noun
|
a white tasteless odorless crystalline product of protein metabolism |
|
|
urate |
Noun
|
a salt of uric acid |
|
|
uptime |
Noun
|
a period of time when something (as a machine or factory) is functioning and available for use |
|
|
unit of time |
Noun
|
a unit for measuring time periods |
|
|
universal time |
Noun
|
the local time at the 0 meridian passing through Greenwich, England |
|
|
uprise |
Verb
|
get up and out of bed |
|
|
uprise |
Verb
|
return from the dead |
|
|
uprise |
Verb
|
move upward |
|
|
uprise |
Verb
|
come up, of celestial bodies |
|
|
uprise |
Verb
|
rise to one's feet |
|
|
uprise |
Verb
|
rise up as in fear |
|
|
uprise |
Verb
|
ascend as a sound |
|
|
uprise |
Verb
|
come into existence |
|
|
underdress |
Verb
|
dress informally and casually |
|
|
underdress |
Verb
|
dress without sufficient warmth |
|
|
ulcerate |
Verb
|
affect with an ulcer |
|
|
ulcerate |
Verb
|
undergo ulceration |
|
|
unstrain |
Verb
|
cause to feel relaxed |
|
|
unlax |
Verb
|
cause to feel relaxed |
|
|
unwind |
Verb
|
cause to feel relaxed |
|
|
unwind |
Verb
|
become less tense, rest, or take one's ease |
|
|
unwind |
Verb
|
reverse the winding or twisting of |
|
|
unwind |
Verb
|
separate the tangles of |