pedesisn.

Brit.

/pᵻˈdiːsɪs/, U.S.

/pəˈdisᵻs/

Origin: A borrowing from Greek. Etymon: Greek πήδησις.

Etymology: < Hellenistic Greek πήδησις leaping, already in ancient Greek in sense ‘beating, throbbing’ of the heart < ancient Greek πηδᾶν to leap, beat, throb (ultimately < the same Indo-European base as foot n. and int.) + ancient Greek -σις -sis suffix.

Science. Now rare.

Brownian motion. Cf. pedetic adj.

ΘΚΠ

the world > matter > physics > mechanics > types of motion > [noun] > irregular oscillation of free particles

Brownian motion1849

Brownian movement1871

pedesis1878

pedetic motion1878

1878 W. S. Jevons in Q. Jrnl. Sci. Apr. 170/1 Some writers have called it the Brownian movement... I have ventured to coin..a new word, and call the motion pedesis, from Gr. πήδησις leaping or bounding.

1892 Nature 3 Mar. 430/1 The fact that pedesis is stopped by the addition of an electrolyte would appear to indicate that the water complices are disintegrated in the presence of ions.

1926 Q. Rev. Biol. 1 105/2 These bodies move around slightly in the protoplasm, apparently of their own accord, resembling an exaggerated but slowed down Brownian movement (pedesis).

1941 Science 15 Aug. 151/1 Since non-living particles exhibit Brownian motion, there were many speculations as to its cause. It was often called ‘pedesis’, because the particles seemed to ‘walk’ about.

1958 R. M. Allen Photomicrography (ed. 2) v. 234 Where living organisms in motion are involved, or Brownian movement (pedesis) in colloidal particles is present, a fractional-second exposure is necessary.

This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).

单词	pedesis
释义	pedesisn. Brit. /pᵻˈdiːsɪs/, U.S. /pəˈdisᵻs/ Origin: A borrowing from Greek. Etymon: Greek πήδησις. Etymology: < Hellenistic Greek πήδησις leaping, already in ancient Greek in sense ‘beating, throbbing’ of the heart < ancient Greek πηδᾶν to leap, beat, throb (ultimately < the same Indo-European base as foot n. and int.) + ancient Greek -σις -sis suffix. Science. Now rare. Brownian motion. Cf. pedetic adj. ΘΚΠ the world > matter > physics > mechanics > types of motion > [noun] > irregular oscillation of free particles Brownian motion1849 Brownian movement1871 pedesis1878 pedetic motion1878 1878 W. S. Jevons in Q. Jrnl. Sci. Apr. 170/1 Some writers have called it the Brownian movement... I have ventured to coin..a new word, and call the motion pedesis, from Gr. πήδησις leaping or bounding. 1892 Nature 3 Mar. 430/1 The fact that pedesis is stopped by the addition of an electrolyte would appear to indicate that the water complices are disintegrated in the presence of ions. 1926 Q. Rev. Biol. 1 105/2 These bodies move around slightly in the protoplasm, apparently of their own accord, resembling an exaggerated but slowed down Brownian movement (pedesis). 1941 Science 15 Aug. 151/1 Since non-living particles exhibit Brownian motion, there were many speculations as to its cause. It was often called ‘pedesis’, because the particles seemed to ‘walk’ about. 1958 R. M. Allen Photomicrography (ed. 2) v. 234 Where living organisms in motion are involved, or Brownian movement (pedesis) in colloidal particles is present, a fractional-second exposure is necessary. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022). < n.1878
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