| Library / English Dictionary |
H2O
I. (noun)
Sense 1
Meaning:
Binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent
Synonyms:
H2O; water
Classified under:
Hypernyms ("H2O" is a kind of...):
binary compound (chemical compound composed of only two elements)
liquid (fluid matter having no fixed shape but a fixed volume)
Meronyms (substance of "H2O"):
atomic number 8; O; oxygen (a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust)
atomic number 1; H; hydrogen (a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe)
Hyponyms (each of the following is a kind of "H2O"):
water of crystallisation; water of crystallization; water of hydration (the water present in hydrated compounds)
bilge; bilge water (water accumulated in the bilge of a ship)
soft water (water that is not hard (does not contain mineral salts that interfere with the formation of lather with soap))
slush (partially melted snow)
fresh water; freshwater (water that is not salty)
brine; saltwater; seawater (water containing salts)
meltwater (melted snow or ice)
limewater (solution of calcium hydroxide in water used as an antacid)
hard water (water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap)
ground water; spring water; well water (underground water that is held in the soil and in pervious rocks)
holy water (water that has been blessed by a priest for use in symbolic purification)
distilled water (water that has been purified by distillation)
dishwater (water in which dishes and cooking utensils are washed)
bath water (water used for a bath)
tap water (water directly from the spigot)
Holonyms ("H2O" is a substance of...):
ice; water ice (water frozen in the solid state)
diamond dust; frost mist; frost snow; ice crystal; ice needle; poudrin; snow mist (small crystals of ice)
flake; snowflake (a crystal of snow)
body of water; water (the part of the earth's surface covered with water (such as a river or lake or ocean))
perspiration; sudor; sweat (salty fluid secreted by sweat glands)
tear; teardrop (a drop of the clear salty saline solution secreted by the lacrimal glands)
Context examples:
Carbon dioxide (CO2) and water vapor (H2O) are the only greenhouse gases that are likely to be present on Mars in sufficient abundance to provide any significant greenhouse warming.
(Mars Terraforming Not Possible Using Present-Day Technology, NASA)
Chemistry of molecules having the form Cn(H2O)n
(Carbohydrate Chemistry, NCI Thesaurus)
Biochemistry of carbohydrates, aldehydic or ketonic derivative of polyhydric alcohols, the name being derived from the fact that the most common examples of such compounds have formulas that may be written Cn(H2O)n (e.g., glucose, C6(H2O)6; sucrose, C12(H2O)11), although they are not true hydrates and the name is in that sense a misnomer.
(Glycobiology, NCI Thesaurus)
The Moon doesn’t have significant amounts of H2O or OH in its atmosphere most of the time.
(Meteoroid Strikes Eject Precious Water From Moon, NASA)
Water is also known by its chemical name H2O because it's made of two hydrogen atoms and one oxygen atom.
(Comet Provides New Clues to Origins of Earth's Oceans, NASA)
The new finding of widespread and relatively immobile water suggests that it may be present primarily as OH, a more reactive relative of H2O that is made of one oxygen atom and one hydrogen atom.
(On Second Thought, the Moon's Water May Be Widespread and Immobile, NASA)
And then, when the event was over, the H2O or OH went away.
(Meteoroid Strikes Eject Precious Water From Moon, NASA)
