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Ontology :: Ontology (n.) That department of the science of metaphysics which investigates and explains the nature and essential properties and relations of all beings, as such, or the principles and causes of being..

Indogen :: Indogen (n.) A complex, nitrogenous radical, C8H5NO, regarded as the essential nucleus of indigo..

Mosasauria :: Mosasauria (n. pl.) An order of large, extinct, marine reptiles, found in the Cretaceous rocks, especially in America. They were serpentlike in form and in having loosely articulated and dilatable jaws, with large recurved tteth, but they had paddlelike feet. Some of them were over fifty feet long. They are, essentially, fossil sea serpents with paddles. Called also Pythonomarpha, and Mosasauria..

Balsam :: Balsam (n.) A resin containing more or less of an essential or volatile oil.

Monomorphous :: Monomorphous (a.) Having but a single form; retaining the same form throughout the various stages of development; of the same or of an essentially similar type of structure; -- opposed to dimorphic, trimorphic, and polymorphic..

Cedrene :: Cedrene (n.) A rich aromatic oil, C15H24, extracted from oil of red cedar, and regarded as a polymeric terpene; also any one of a class of similar substances, as the essential oils of cloves, cubebs, juniper, etc., of which cedrene proper is the type..

Necessary :: Necessary (n.) A thing that is necessary or indispensable to some purpose; something that one can not do without; a requisite; an essential; -- used chiefly in the plural; as, the necessaries of life..

Gummite :: Gummite (n.) A yellow amorphous mineral, essentially a hydrated oxide of uranium derived from the alteration of uraninite..

Ethyl :: Ethyl (n.) A monatomic, hydrocarbon radical, C2H5 of the paraffin series, forming the essential radical of ethane, and of common alcohol and ether..

Mutilation :: Mutilation (n.) The act of mutilating, or the state of being mutilated; deprivation of a limb or of an essential part..

Organ :: Organ (n.) A component part performing an essential office in the working of any complex machine; as, the cylinder, valves, crank, etc., are organs of the steam engine..

Norite :: Norite (n.) A granular crystalline rock consisting essentially of a triclinic feldspar (as labradorite) and hypersthene.

Spikenard :: Spikenard (n.) A fragrant essential oil, as that from the Nardostachys Jatamansi..

Heteroousian :: Heteroousian (a.) Having different essential qualities; of a different nature.

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..

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

Radical :: Radical (n.) A characteristic, essential, and fundamental constituent of any compound; hence, sometimes, an atom..

Methyl :: Methyl (n.) A hydrocarbon radical, CH3, not existing alone but regarded as an essential residue of methane, and appearing as a component part of many derivatives; as, methyl alcohol, methyl ether, methyl amine, etc..

Fergusonite :: Fergusonite (n.) A mineral of a brownish black color, essentially a tantalo-niobate of yttrium, erbium, and cerium; -- so called after Robert Ferguson..

Cutose :: Cutose (n.) A variety of cellulose, occuring as a fine transparent membrane covering the aerial organs of plants, and forming an essential ingredient of cork; by oxidation it passes to suberic acid..

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