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The lintel of a fireplace when of wood, as frequently in early houses.

Exchange; replacement; substitution; metathesis. [R.]

The act, process, or result of exchange, substitution, or replacement of atoms and radicals; thus, by metathesis an acid gives up all or part of its hydrogen, takes on an equivalent amount of a metal or base, and forms a salt.

e and other fishy products. It is regarded as ammonia in which a third of its hydrogen is replaced by methyl, and is a type of the class of substituted ammonias. -- Methyl ether (Chem.), a light, volatile ether CH3.O.CH3, obtained by the etherification of methyl alcohol; -- called also methyl oxide. -- Methyl green.…

An alcoholate of methyl alcohol in which the hydroxyl hydrogen is replaced by a metal, after the analogy of a hydrate; as, sodium methylate, CH3ONa.

scutcheon, 2. -- Milk molar (Anat.), one of the deciduous molar teeth which are shed and replaced by the premolars. -- Milk of lime (Chem.), a watery emulsion of calcium hydrate, produced by macerating quicklime in water. -- Milk parsley (Bot.), an umbelliferous plant (Peucedanum palustre) of Europe and Asia, having…

Any one of the teeth back of the incisors and canines. The molar which replace the deciduous or milk teeth are designated as premolars, and those which are not preceded by deciduous teeth are sometimes called true molars. See Tooth.

Having one hydrogen atom replaceable by a negative or acid atom or radical; capable of neutralizing a monobasic acid; -- said of bases, and of certain metals.

An atom or radical whose valence is one, or which can combine with, be replaced by, or exchanged for, one atom of hydrogen. Monad deme (Biol.), in tectology, a unit of the first order of individuality.

neutralized by a univalent base or basic radical; having but one acid hydrogen atom to be replaced; -- said of acids; as, acetic, nitric, and hydrochloric acids are monobasic.

r cylinder on a horizontal plane. -- Neutral salt (Chem.), a salt formed by the complete replacement of the hydrogen in an acid or base; in the former case by a positive or basic, in the latter by a negative or acid, element or radical. -- Neutral tint, a bluish gray pigment, used in water colors, made by mixing indi…

Of or pertaining to the replacement of bone; as, an osteoplastic operation.

A device intended to replace the wheel of a self-propelled vehicle for use on rough roads and to approximate to the smoothness in running of a wheel on a metal track. The tread consists of a number of rubber shod feet which are connected by ball-and-socket joints to the ends of sliding spokes. Each spoke has attached t…

everal molecules of a monobasic acid; having more than one hydrogen atom capable of being replaced by acid radicals; -- said of certain bases; as, calcium hydrate and glycerin are polyacid bases.

with, several molecules of a monacid base; having several hydrogen atoms capable of being replaced by basic radicals; -- said of certain acids; as, sulphuric acid is polybasic.

An anterior molar tooth which has replaced a deciduous molar. See Tooth.

lity or property in the first degree; having undergone the first stage of substitution or replacement. Primary alcohol (Organic Chem.), any alcohol which possess the group CH2.OH, and can be oxidized so as to form a corresponding aldehyde and acid having the same number of carbon atoms; -- distinguished from secondary…

The addition to the human body of some artificial part, to replace one that is wanting, as a log or an eye; -- called also prothesis.

of paralysis in which the muscles are apparently enlarged, but are really degenerated and replaced by fat.

et, as the hands of a clock, to an earlier hour. (d) To restore to the original place; to replace. -- To put by. (a) To turn, set, or thrust, aside. "Smiling put the question by." Tennyson. (b) To lay aside; to keep; to sore up; as, to put by money. -- To put down. (a) To lay down; to deposit; to set down. (b) To low…