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Concentric vs Conchoidal - What's the difference?

concentric | conchoidal |

As adjectives the difference between concentric and conchoidal

is that concentric is having a common center while conchoidal is of or pertaining to a conchoid; that may be defined as a conchoid.

concentric

English

Alternative forms

* coencentric

Adjective

(en adjective)
  • (geometry) Having a common center.
  • (physiology) (of a motion) in the direction of contraction of a muscle. (E.g. extension of the lower arm via the elbow joint while contracting the triceps and other elbow extensor muscles; closing of the jaw while flexing the masseter).
    • Antonym: eccentric. Concentric and eccentric movements are collectively referred to as isotonic (with motion), the antonym of which is isometric (without motion).

    Antonyms

    * (physiology) eccentric

    Related terms

    * concentricity

    See also

    * ("concentric" on Wikipedia)

    conchoidal

    English

    (Conchoidal fracture)

    Adjective

    (en adjective)
  • (mathematics) Of or pertaining to a conchoid; that may be defined as a conchoid.
  • * , 1976, D. T. Whiteside (editor), The Mathematical Papers of Isaac Newton , Volume 7: 1691-1695, page 621,
    • a conchoidal hyperbola with an oval at its convexity.
  • (mineralogy, of a fracture) Irregular, with planar, concentric curves, similar to those on a mussel shell.
  • * 1821 , Coal'', entry in Andrew Ure, ''A Dictionary of Chemistry on the Basis of Mr Nicholson's , unnumbered page,
    • It[pitch-coal] is distinguished by its splendent lustre and conchoidal fracture.
  • * 2005 , Chapter 19: Lithic Studies'', Herbert D. G. Maschner, Christopher Chippindale (editors), ''Handbook of Archaeological Methods , Volume 1, page 719,
    • Some flakes detached in a controlled manner have characteristics of conchoidal fracture.
  • * 2011 , Robert C Shaler, Crime Scene Forensics: A Scientific Method Approach , page 479,
    • On one side of the radial edge, the conchoidal fractures form right angles, that is, form a perpendicular with the edge.
  • * 2011 , David H. Krinsley, John C. Doornkamp, Atlas of Quartz Sand Surface Textures , page 10,
    • If grains derived from these rocks are unweathered after separation from the parent rock (a very rare occurrence), they may contain either conchoidal breakage patterns if grains are large, or upturned plates and flat upper and lower surfaces if small grains are considered.
  • (mineralogy, of a mineral ) That fractures with planar concentric curves (e.g., as flint, chert or obsidian).
  • * 1821 , Focus of Philosophy, Science and Art , Volume 1, Issues 1-4, page 74,
    • The customary transitions of pitchstone are, into Chalcedony, Chert, Semi-opal; also into a substance resembling conchoidal shining jasper, found in clay strata, entangled in trap, or volcanic rock; and lastly, into Trap.