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Homology :: Homology (n.) The correspondence or resemblance of substances belonging to the same type or series; a similarity of composition varying by a small, regular difference, and usually attended by a regular variation in physical properties; as, there is an homology between methane, CH4, ethane, C2H6, propane, C3H8, etc., all members of the paraffin series. In an extended sense, the term is applied to the relation between chemical elements of the same group; as, chlorine, bromine, and iodine are said

Argon :: Argon (n.) A substance regarded as an element, contained in the atmosphere and remarkable for its chemical inertness..

Neurokeratin :: Neurokeratin (n.) A substance, resembling keratin, present in nerve tissue, as in the sheath of the axis cylinder of medullated nerve fibers. Like keratin it resists the action of most chemical agents, and by decomposition with sulphuric acid yields leucin and tyrosin..

Formaldehyde :: Formaldehyde (n.) A colorless, volatile liquid, H2CO, resembling acetic or ethyl aldehyde, and chemically intermediate between methyl alcohol and formic acid..

Metasomatism :: Metasomatism (n.) An alteration in a mineral or rock mass when involving a chemical change of the substance, as of chrysolite to serpentine; -- opposed to ordinary metamorphism, as implying simply a recrystallization..

React :: React (v. i.) To act upon each other; to exercise a reciprocal or a reverse effect, as two or more chemical agents; to act in opposition..

Extract :: Extract (v. t.) To withdraw by expression, distillation, or other mechanical or chemical process; as, to extract an essence. Cf. Abstract, v. t., 6..

Agent :: Agent (n.) An active power or cause; that which has the power to produce an effect; as, a physical, chemical, or medicinal agent; as, heat is a powerful agent..

Diactinic :: Diactinic (a.) Capable of transmitting the chemical or actinic rays of light; as, diactinic media..

Analysis :: Analysis (n.) The separation of a compound substance, by chemical processes, into its constituents, with a view to ascertain either (a) what elements it contains, or (b) how much of each element is present. The former is called qualitative, and the latter quantitative analysis..

Bronzing :: Bronzing (n.) The act or art of communicating to articles in metal, wood, clay, plaster, etc., the appearance of bronze by means of bronze powders, or imitative painting, or by chemical processes..

Chemism :: Chemism (n.) The force exerted between the atoms of elementary substance whereby they unite to form chemical compounds; chemical attaction; affinity; -- sometimes used as a general expression for chemical activity or relationship.

Attack :: Attack (n.) The beginning of corrosive, decomposing, or destructive action, by a chemical agent..

Thermochemistry :: Thermochemistry (n.) That branch of chemical science which includes the investigation of the various relations existing between chemical action and that manifestation of force termed heat, or the determination of the heat evolved by, or employed in, chemical actions..

Mineral :: Mineral (v. i.) An inorganic species or substance occurring in nature, having a definite chemical composition and usually a distinct crystalline form. Rocks, except certain glassy igneous forms, are either simple minerals or aggregates of minerals..

Plate :: Plate (v. t.) To cover or overlay with gold, silver, or other metals, either by a mechanical process, as hammering, or by a chemical process, as electrotyping..

Extractive :: Extractive (n.) A chemical principle once supposed to exist in all extracts.

Tropidine :: Tropidine (n.) An alkaloid, C8H13N, obtained by the chemical dehydration of tropine, as an oily liquid having a coninelike odor..

Chemosmosis :: Chemosmosis (n.) Chemical action taking place through an intervening membrane.

Condense :: Condense (v. i.) To combine or unite (as two chemical substances) with or without separation of some unimportant side products.

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