Definition of primitive rocks. Meaning of primitive rocks. Synonyms of primitive rocks

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Definition of primitive rocks

primitive rocks
Primary Pri"ma*ry, a. [L. primarius, fr. primus first: cf. F. primaire. See Prime, a., and cf. Premier, Primero.] 1. First in order of time or development or in intention; primitive; fundamental; original. The church of Christ, in its primary institution. --Bp. Pearson. These I call original, or primary, qualities of body. --Locke. 2. First in order, as being preparatory to something higher; as, primary assemblies; primary schools. 3. First in dignity or importance; chief; principal; as, primary planets; a matter of primary importance. 4. (Geol.) Earliest formed; fundamental. 5. (Chem.) Illustrating, possessing, or characterized by, some quality 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 & tertiary alcohols. Primary amine (Chem.), an amine containing the amido group, or a derivative of ammonia in which only one atom of hydrogen has been replaced by a basic radical; -- distinguished from secondary & tertiary amines. Primary amputation (Surg.), an amputation for injury performed as soon as the shock due to the injury has passed away, and before symptoms of inflammation supervene. Primary axis (Bot.), the main stalk which bears a whole cluster of flowers. Primary colors. See under Color. Primary meeting, a meeting of citizens at which the first steps are taken towards the nomination of candidates, etc. See Caucus. Primary pinna (Bot.), one of those portions of a compound leaf or frond which branch off directly from the main rhachis or stem, whether simple or compounded. Primary planets. (Astron.) See the Note under Planet. Primary qualities of bodies, such are essential to and inseparable from them. Primary quills (Zo["o]l.), the largest feathers of the wing of a bird; primaries. Primary rocks (Geol.), a term early used for rocks supposed to have been first formed, being crystalline and containing no organic remains, as granite, gneiss, etc.; -- called also primitive rocks. The terms Secondary, Tertiary, and Quaternary rocks have also been used in like manner, but of these the last two only are now in use. Primary salt (Chem.), a salt derived from a polybasic acid in which only one acid hydrogen atom has been replaced by a base or basic radical. Primary syphilis (Med.), the initial stage of syphilis, including the period from the development of the original lesion or chancre to the first manifestation of symptoms indicative of general constitutional infection. Primary union (Surg.), union without suppuration; union by the first intention.
Primitive rocks
Primitive Prim"i*tive, a. [L. primitivus, fr. primus the first: cf. F. primitif. See Prime, a.] 1. Of or pertaining to the beginning or origin, or to early times; original; primordial; primeval; first; as, primitive innocence; the primitive church. ``Our primitive great sire.' --Milton. 2. Of or pertaining to a former time; old-fashioned; characterized by simplicity; as, a primitive style of dress. 3. Original; primary; radical; not derived; as, primitive verb in grammar. Primitive axes of co["o]rdinate (Geom.), that system of axes to which the points of a magnitude are first referred, with reference to a second set or system, to which they are afterward referred. Primitive chord (Mus.), that chord, the lowest note of which is of the same literal denomination as the fundamental base of the harmony; -- opposed to derivative. --Moore (Encyc. of Music). Primitive circle (Spherical Projection), the circle cut from the sphere to be projected, by the primitive plane. Primitive colors (Paint.), primary colors. See under Color. Primitive Fathers (Eccl.), the acknowledged Christian writers who flourished before the Council of Nice, A. D. 325. --Shipley. Primitive groove (Anat.), a depression or groove in the epiblast of the primitive streak. It is not connected with the medullary groove, which appears later and in front of it. Primitive plane (Spherical Projection), the plane upon which the projections are made, generally coinciding with some principal circle of the sphere, as the equator or a meridian. Primitive rocks (Geol.), primary rocks. See under Primary. Primitive sheath. (Anat.) See Neurilemma. Primitive streak or trace (Anat.), an opaque and thickened band where the mesoblast first appears in the vertebrate blastoderm. Syn: First; original; radical; pristine; ancient; primeval; antiquated; old-fashioned.

Meaning of primitive rocks from wikipedia

- System. Primitive rocks are common on the surfaces of many asteroids, and the majority of meteorites are primitive rocks." An example of a primitive rock...
- fingerprints to lithium compositions in zircons from continental crust and primitive rocks similar to the Earth's mantle, they found evidence that the young planet...
- as granite, gneiss, etc.; – called also primitive rocks. The terms Secondary, Tertiary, and Quaternary rocks have also been used in like manner, but of...
- comparable in composition to the primitive mantle. Volcanic rocks from hotspot areas often have a primitive composition. Because the magma at hotspots is supposed...
- polymorphs and muscovite. While still dominated by silicates, more primitive volcanic rocks have mineral ****emblages with less silica, such as olivine and...
- high). Typically, primitive melts of this composition form lamprophyre, lamproite, kimberlite and sometimes nepheline-bearing mafic rocks such as alkali...
- s**** are not common in the main whale-bearing rocks, but are very common in other rocks; many fallen rocks can be seen to be full of a wide variety of fossil...
- primary melt or a primitive melt, and identifying whether the magma has dropped out ****ulate minerals is equally important even for rocks which carry no...
- Dryosaurids were primitive iguanodonts. They are known from Middle Jur****ic to Early Cretaceous rocks of Africa, Europe, and North America. Until recently...
- the product of a distillation from great depth and issues from the primitive rocks beneath which the forces of all volcanic action lie".[citation needed]...
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