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Siderostat :: Siderostat (n.) An apparatus consisting essentially of a mirror moved by clockwork so as to throw the rays of the sun or a star in a fixed direction; -- a more general term for heliostat.

Diabase :: Diabase (n.) A basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene with magnetic iron; -- often limited to rocks pretertiary in age. It includes part of what was early called greenstone..

Chrysarobin :: Chrysarobin (n.) A bitter, yellow substance forming the essential constituent of Goa powder, and yielding chrysophanic acid proper; hence formerly called also chrysphanic acid..

Rickets :: Rickets (n. pl.) A disease which affects children, and which is characterized by a bulky head, crooked spine and limbs, depressed ribs, enlarged and spongy articular epiphyses, tumid abdomen, and short stature, together with clear and often premature mental faculties. The essential cause of the disease appears to be the nondeposition of earthy salts in the osteoid tissues. Children afflicted with this malady stand and walk unsteadily. Called also rachitis..

Vaseline :: Vaseline (n.) A yellowish translucent substance, almost odorless and tasteless, obtained as a residue in the purification of crude petroleum, and consisting essentially of a mixture of several of the higher members of the paraffin series. It is used as an unguent, and for various purposes in the arts. See the Note under Petrolatum..

Hexyl :: Hexyl (n.) A compound radical, C6H13, regarded as the essential residue of hexane, and a related series of compounds..

Perigone :: Perigone (n.) Any organ inclosing the essential organs of a flower; a perianth.

Tourniquet :: Tourniquet (n.) An instrument for arresting hemorrhage. It consists essentially of a pad or compress upon which pressure is made by a band which is tightened by a screw or other means.

Moment :: Moment (n.) An essential element; a deciding point, fact, or consideration; an essential or influential circumstance..

Distill :: Distill (v. t.) To obtain by distillation; to extract by distillation, as spirits, essential oil, etc.; to rectify; as, to distill brandy from wine; to distill alcoholic spirits from grain; to distill essential oils from flowers, etc.; to distill fresh water from sea water..

Tantalite :: Tantalite (n.) A heavy mineral of an iron-black color and submetallic luster. It is essentially a tantalate of iron.

Substantialness :: Substantially (adv.) In a substantial manner; in substance; essentially.

Essentiality :: Essentiality (n.) The quality of being essential; the essential part.

Gyrostat :: Gyrostat (n.) A modification of the gyroscope, consisting essentially of a fly wheel fixed inside a rigid case to which is attached a thin flange of metal for supporting the instrument. It is used in studying the dynamics of rotating bodies..

Radicality :: Radicality (n.) Radicalness; relation to a root in essential nature or principle.

System :: System (n.) An assemblage of parts or organs, either in animal or plant, essential to the performance of some particular function or functions which as a rule are of greater complexity than those manifested by a single organ; as, the capillary system, the muscular system, the digestive system, etc.; hence, the whole body as a functional unity..

Cabazite :: Cabazite (n.) A mineral occuring in glassy rhombohedral crystals, varying, in color from white to yellow or red. It is essentially a hydrous silicate of alumina and lime. Called also chabasie..

Full :: Full (Compar.) Not wanting in any essential quality; complete, entire; perfect; adequate; as, a full narrative; a person of full age; a full stop; a full face; the full moon..

Cellulose :: Cellulose (n.) The substance which constitutes the essential part of the solid framework of plants, of ordinary wood, linen, paper, etc. It is also found to a slight extent in certain animals, as the tunicates. It is a carbohydrate, (C6H10O5)n, isomeric with starch, and is convertible into starches and sugars by the action of heat and acids. When pure, it is a white amorphous mass. See Starch, Granulose, Lignin..

Garancin :: Garancin (n.) An extract of madder by sulphuric acid. It consists essentially of alizarin.

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