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Essential :: Essential (a.) Containing the essence or characteristic portion of a substance, as of a plant; highly rectified; pure; hence, unmixed; as, an essential oil..

Methylene :: Methylene (n.) A hydrocarbon radical, CH2, not known in the free state, but regarded as an essential residue and component of certain derivatives of methane; as, methylene bromide, CH2Br2; -- formerly called also methene..

Abstract :: Abstract (a.) That which comprises or concentrates in itself the essential qualities of a larger thing or of several things. Specifically: A summary or an epitome, as of a treatise or book, or of a statement; a brief..

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

Glycolyl :: Glycolyl (n.) A divalent, compound radical, CO.CH2, regarded as the essential radical of glycolic acid, and a large series of related compounds..

Mortify :: Mortify (v. t.) To destroy the active powers or essential qualities of; to change by chemical action.

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.

Prosylogism :: Prosylogism (n.) A syllogism preliminary or logically essential to another syllogism; the conclusion of such a syllogism, which becomes a premise of the following syllogism..

Accidental :: Accidental (n.) A property which is not essential; a nonessential; anything happening accidentally.

Type :: Type (n.) A general form or structure common to a number of individuals; hence, the ideal representation of a species, genus, or other group, combining the essential characteristics; an animal or plant possessing or exemplifying the essential characteristics of a species, genus, or other group. Also, a group or division of animals having a certain typical or characteristic structure of body maintained within the group..

Extraneous :: Extraneous (a.) Not belonging to, or dependent upon, a thing; without or beyond a thing; not essential or intrinsic; foreign; as, to separate gold from extraneous matter..

Dolerite :: Dolerite (n.) A dark-colored, basic, igneous rock, composed essentially of pyroxene and a triclinic feldspar with magnetic iron. By many authors it is considered equivalent to a coarse-grained basalt..

Verdigris :: Verdigris (n.) A green poisonous substance used as a pigment and drug, obtained by the action of acetic acid on copper, and consisting essentially of a complex mixture of several basic copper acetates..

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..

Digitain :: Digitain (n.) A supposedly distinct vegetable principle as the essential ingredient of the extracts. It is a white, crystalline substance, and is regarded as a glucoside..

Lactucone :: Lactucone (n.) A white, crystalline, tasteless substance, found in the milky sap of species of Lactuca, and constituting an essential ingredient of lactucarium..

Picamar :: Picamar (n.) An oily liquid hydrocarbon extracted from the creosote of beechwood tar. It consists essentially of certain derivatives of pyrogallol.

Kernel :: Kernel (n.) The central, substantial or essential part of anything; the gist; the core; as, the kernel of an argument..

Felsite :: Felsite (n.) A finegrained rock, flintlike in fracture, consisting essentially of orthoclase feldspar with occasional grains of quartz..

Burette :: Burette (n.) An apparatus for delivering measured quantities of liquid or for measuring the quantity of liquid or gas received or discharged. It consists essentially of a graduated glass tube, usually furnished with a small aperture and stopcock..

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