| 释义 |
peristaltic, a. Physiol.|pɛrɪˈstæltɪk|
[ad. Gr. περισταλτικ-ός (Galen), f. περιστέλλ-ειν lit. to send round, f. στέλλειν to set, place, array, make ready, dispatch, send. Cf. F. péristaltique (1680 in Hatz.-Darm.).]
Applied to the automatic muscular (vermicular) movement which takes place in the alimentary canal and other hollow or tubular organs, consisting of rhythmic wave-like contractions in successive circles, by which the contents of the organ are propelled along it.
1655Culpepper, etc. Riverius ix. vii. 266 This vomiting cometh by the Peristaltick motion of the Guts. 1676Cole in Phil. Trans. XI. 609 Both these kinds of vessels seem to have a peristaltick contraction of their own. 1753N. Torriano Midwifry 14 The inverting peristaltic Motion of the Fallopian Tube. 1881Darwin Veg. Mould 116 When the earth was in a very liquid state it was ejected in little spurts, and when not so liquid by a slow peristaltic movement.
b. transf. (Electr.) See quot.
1856Thomson Math. & Phys. Papers (1884) II. lxxv. 80, I..venture to introduce the term peristaltic to characterize that kind of induction by which currents are excited in elongated conductors through the variation of electrostatic potential in the surrounding matter.
Hence periˈstaltically adv., in a peristaltic manner; with peristaltic action or movement.
1859Todd Cycl. Anat. V. 678/1 The food is propelled onwards peristaltically. 1868Owen Anat. Vertebr. III. 501 Insulating the peristaltically winding intestines from the constant respiratory movements of the abdominal walls.
Add:2. Special collocation: peristaltic pump, a mechanical pump in which pressure is provided by the movement of a constriction along a tube, as in biological peristalsis.
1976C. Culpin Farm Machinery (ed. 9) viii. 105/2 Liquid fertilizers are sometimes applied by means of a very simple type of ground-driven *peristaltic pump (squeeze pump). 1989G. Nicolis in P. Davies New Physics xi. 321/1 (caption) Experimental realisation of an open system. Three peristaltic pumps feed the reagents into the reactor. |