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Webster’s Dictionary (1828)



178 words match “HYDRA”

NEUTER n.
, or but imperfectly developed ones, as a plant without stamens or pistils, as the garden Hydrangea; esp., one of the imperfectly developed females of certain social insects, as of the ant and the common honeybee, which perform the labors of the community, and are called workers.
NORMAL a.
ting certain hypothetical compounds, as acids from which the real acids are obtained by dehydration; thus, normal sulphuric acid and normal nitric acid are respectively S(OH)6, and N(OH)5.
NUT n.
rosa of Europe. -- Nut grass (Bot.), a plant of the Sedge family (Cyperus rotundus, var. Hydra), which has slender rootstocks bearing small, nutlike tubers, by which the plant multiplies exceedingly, especially in cotton fields. -- Nut lock, a device, as a metal plate bent up at the corners, to prevent a nut from bec…
OSCULUM n.
x indicating that the substance to the name of wich it is affixed is a member of the carbohydrate group; as in cellulose, sucrose, dextrose, etc.
OXYACID n.
An acid containing oxygen, as chloric acid or sulphuric acid; - - contrasted with the hydracids, which contain no oxygen, as hydrochloric acid. See Acid, and Hydroxy-.
PECTIN n.
One of a series of carbohydrates, commonly called vegetable jelly, found very widely distributed in the vegetable kingdom, especially in ripe fleshy fruits, as apples, cranberries, etc. It is extracted as variously colored, translucent substances, which are soluble in hot water but become viscous on cooling.…
PECTOSE n.
An amorphous carbohydrate found in the vegetable kingdom, esp. in unripe fruits. It is associated with cellulose, and is converted into substances of the pectin group.
PENTOSAN; PENTOSANE n.
One of a class of substances (complex carbohydrates widely distributed in plants, as in fruits, gums, woods, hay, etc.) which yield pentoses on hydrolysis.
PHENYL n.
al residue of benzene, and the basis of an immense number of aromatic derivatives. Phenyl hydrate (Chem.), phenol or carbolic acid. -- Phenyl hydrazine (Chem.), a nitrogenous base (C6H5.N2H3) produced artificially as a colorless oil which unites with acids, ketones, etc., to form well-crystallized compounds.…
PHOTOSYNTHESIS n.
The process of constructive metabolism by which carbohydrates are formed from water vapor and the carbon dioxide of the air in the chlorophyll-containing tissues of plants exposed to the action of light. It was formerly called assimilation, but this is now commonly used as in animal physiology. The details of the proce…
PILE n.
ch falls upon the pile. -- Pile dwelling. See Lake dwelling, under Lake. -- Pile plank (Hydraul. Eng.), a thick plank used as a pile in sheet piling. See Sheet piling, under Piling. -- Pneumatic pile. See under Pneumatic. -- Screw pile, one with a screw at the lower end, and sunk by rotation aided by pressure.…
PLUG n.
A block of wood let into a wall, to afford a hold for nails. Fire plug, a street hydrant to which hose may be attached. [U. S.] -- Hawse plug (Naut.), a plug to stop a hawse hole. -- Plug and feather. (Stone Working) See Feather, n., 7. -- Plug centerbit, a centerbit ending in a small cylinder instead of a point, so…
POLYACID a.
en atom capable of being replaced by acid radicals; -- said of certain bases; as, calcium hydrate and glycerin are polyacid bases.
POLYP n.
hozoa. See Anthozoa, Madreporaria, Hydroid. [Written also polype.] Fresh-water polyp, the hydra. -- Polyp stem (Zoöl.), that portion of the stem of a siphonophore which bears the polypites, or feeding zooids.
POLYPITE n.
One of the feeding zooids, or polyps, of a coral, hydroid, or siphonophore; a hydranth. See Illust. of Campanularian.
POT n.
ight. -- Pot plant (Bot.), either of the trees which bear the monkey-pot. -- Pot wheel (Hydraul.), a noria. -- To go to pot, to go to destruction; to come to an end of usefulness; to become refuse. [Colloq.] Dryden. J. G. Saxe.
POTASH n.
The hydroxide of potassium hydrate, a hard white brittle substance, KOH, having strong caustic and alkaline properties; -- hence called also caustic potash.
PUMP n.
An hydraulic machine, variously constructed, for raising or transferring fluids, consisting essentially of a moving piece or piston working in a hollow cylinder or other cavity, with valves properly placed for admitting or retaining the fluid as it is drawn or driven through them by the action of the piston.…
PYROSULPHURIC a.
uric acid. It is used in the solution of indigo, in the manufacture of alizarin, and in dehydration.
RAM n. 2 definitions
A hydraulic ram. See under Hydraulic.
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