|
|
nephelinite |
Noun
|
an igneous rock consisting of nepheline and pyroxene |
|
|
nephrite |
Noun
|
an amphibole mineral consisting of calcium magnesium silicate in monoclinic crystalline form |
|
|
niobite |
Noun
|
a black mineral that is an ore of niobium and tantalum |
|
|
nitrocalcite |
Noun
|
the mineral form of calcium nitrate |
|
|
nuclear fuel |
Noun
|
fuel (such as uranium) that can be used in nuclear reactors as a source of electricity |
|
|
nerve growth factor |
Noun
|
a protein that is involved in the growth of peripheral nerve cells |
|
|
nucleoprotein |
Noun
|
any of several substances found in the nuclei of all living cells |
|
|
nicotine |
Noun
|
an alkaloid poison that occurs in tobacco |
|
|
nitrogen dioxide |
Noun
|
a highly poisonous brown gas (NO2) |
|
|
nitric oxide |
Noun
|
a poisonous red-brown gas; chemical formula is NO |
|
|
nitrohydrochloric acid |
Noun
|
a yellow fuming corrosive mixture of nitric and hydrochloric acid that dissolves metals (including gold) |
|
|
norethindrone |
Noun
|
a synthetic progestational hormone (trade name Norlutin) used in oral contraceptives and to treat endometriosis |
|
|
norethindrone acetate |
Noun
|
a synthetic progestational hormone (trade name Norlutin) used in oral contraceptives and to treat endometriosis |
|
|
norethandrolone |
Noun
|
a synthetic progestational hormone (trade name Norlutin) used in oral contraceptives and to treat endometriosis |
|
|
norethynodrel |
Noun
|
a progesterone derivative used in oral contraceptives and in the control of menstruation and the treatment of abnormal uterine bleeding |
|
|
norgestrel |
Noun
|
synthetic progestin used in oral contraceptives |
|
|
nandrolone |
Noun
|
an androgen (trade names Durabolin or Kabolin) that is used to treat testosterone deficiency or breast cancer or osteoporosis |
|
|
nacre |
Noun
|
the iridescent internal layer of a mollusk shell |
|
|
nitric acid |
Noun
|
acid used especially in the production of fertilizers and explosives and rocket fuels |
|
|
nitrous acid |
Noun
|
an unstable inorganic acid known only in solution and as nitrite salts |
|
|
nitrogen oxide |
Noun
|
any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials |
|
|
nitrochloroform |
Noun
|
a heavy colorless insoluble liquid compound that causes tears and vomiting |
|
|
nitrochloromethane |
Noun
|
gaseous form of chloropicrin used as tear gas |
|
|
neem cake |
Noun
|
residue after oil is pressed from neem seeds |
|
|
nitrocellulose |
Noun
|
a nitric acid ester |
|
|
nitrocotton |
Noun
|
a nitric acid ester |
|
|
native sulfur |
Noun
|
an old name for sulfur |
|
|
native sulphur |
Noun
|
an old name for sulfur |
|
|
neurochemical |
Noun
|
any organic substance that occurs in neural activity |
|
|
neurotransmitter |
Noun
|
a neurochemical that transmits nerve impulses across a synapse |
|
|
nonconductor |
Noun
|
a material such as glass or porcelain with negligible electrical or thermal conductivity |
|
|
nuclear RNA |
Noun
|
ribonucleic acid found in the nucleolus of the cell |
|
|
nRNA |
Noun
|
ribonucleic acid found in the nucleolus of the cell |
|
|
nitrile |
Noun
|
any of a class of organic compounds containing the cyano radical -CN |
|
|
nitril |
Noun
|
any of a class of organic compounds containing the cyano radical -CN |
|
|
noncoding DNA |
Noun
|
sequence of a eukaryotic gene's DNA that is not translated into a protein |
|
|
natural glass |
Noun
|
magma of any composition that cooled very rapidly |
|
|
natural resin |
Noun
|
a plant exudate |
|
|
niter |
Noun
|
(KNO3) used especially as a fertilizer and explosive |
|
|
nitre |
Noun
|
(KNO3) used especially as a fertilizer and explosive |
|
|
nitroglycerin |
Noun
|
a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol |
|
|
nitroglycerine |
Noun
|
a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol |
|
|
night soil |
Noun
|
human excreta used as fertilizer |
|
|
nutrient agar |
Noun
|
any culture medium that uses agar as the gelling agent |
|
|
neroli oil |
Noun
|
an odoriferous yellow oil found in orange flowers and used in perfumery and as a flavoring |
|
|
nitrogen mustard |
Noun
|
a toxic compound resembling mustard gas in structure |
|
|
napalm |
Noun
|
gasoline jelled with aluminum soaps |
|
|
naphtha |
Noun
|
any of various volatile flammable liquid hydrocarbon mixtures |
|
|
naphthalene |
Noun
|
a white crystalline strong-smelling hydrocarbon made from coal tar or petroleum and used in organic synthesis and as a fumigant in mothballs |
|
|
naphthol |
Noun
|
either of two phenols derived from naphthalene |