flocculusn.

Brit.

/ˈflɒkjᵿləs/, U.S.

/ˈflɑkjələs/

Forms: Plural flocculi.

Etymology: < modern Latin flocculus, diminutive of Latin floccus flock n.²

A small flock or tuft.

1. A small quantity of loosely-aggregated matter resembling a flock of wool, held in suspension in, or precipitated from, a fluid.

ΚΠ

1799 R. Kirwan Geol. Ess. 116 The very little that was dissolved was soon precipitated again in the form of minute flocculi.

1862 H. Spencer First Princ. ii. x. §87. 290 If we assume the first stage in nebular condensation to be the precipitation into flocculi of denser matter.

1872 J. S. Cohen Dis. Throat 3 Small quantities of it having coagulated spontaneously into clots or flocculi.

2. Anatomy. A small lobe in the under surface of the cerebellum, immediately behind the middle peduncle; the subpeduncular lobe.

ΚΠ

1840 G. V. Ellis Demonstr. Anat. 49 The flocculus, or sub-peduncular lobe.

1872 St. G. Mivart Lessons Elem. Anat. ix. 367.

3. Astronomy.

a. Applied to the wisps of luminosity in a nebula.

ΘΚΠ

the world > the universe > constellation > nebula > [noun] > luminous wisp

flocculus1826

1826 Herschel in Mem. Astron. Soc. Lond. II. 491 The flocculi [in the nebula of Orion], instead of being generally round, are drawn out into little wisps.

b. One of the small cloudy wisps or masses on the sun's surface, revealed when the sun is photographed with the spectroheliograph.

ΘΚΠ

the world > the universe > sun > solar activity > [noun] > mark on sun

facula1706

rice grain1864

flocculus1903

1903 G. E. Hale in Publ. Yerkes Observ. III. i. 5 I now propose the name flocculi for the regions on the Sun's disk which are shown only on photographs made with the spectroheliograph.

1903 G. E. Hale in Publ. Yerkes Observ. III. i. 14 It is necessary to speak of calcium flocculi, hydrogen flocculi etc. as the..forms of the various vapors in the same part of the disk are not identical.

1915 G. E. Hale Ten Years Wk. Mount. Observ. 20 The spectroheliograph..discloses extensive clouds of calcium, hydrogen, iron, and other vapors, which..are recorded (as flocculi).

1930 R. H. Baker Astron. vii. 291 In the calcium spectroheliograms the flocculi are generally bright, and they are especially conspicuous in the sun-spot zones.

1953 L. H. Aller Astrophysics ix. 341 Elsewhere on the disk are often seen large sinuous dark filaments or dark flocculi, prominences seen in projection.

1967 R. Michard in J. N. Xanthakis Solar Physics v. 116 One can see that these flocculi are organized in a large cellular network..visible mainly on average-quality pictures where the fine structure is smoothed out.

This entry has not yet been fully updated (first published 1897; most recently modified version published online March 2022).

单词	flocculus
释义	flocculusn. Brit. /ˈflɒkjᵿləs/, U.S. /ˈflɑkjələs/ Forms: Plural flocculi. Etymology: < modern Latin flocculus, diminutive of Latin floccus flock n.² A small flock or tuft. 1. A small quantity of loosely-aggregated matter resembling a flock of wool, held in suspension in, or precipitated from, a fluid. ΚΠ 1799 R. Kirwan Geol. Ess. 116 The very little that was dissolved was soon precipitated again in the form of minute flocculi. 1862 H. Spencer First Princ. ii. x. §87. 290 If we assume the first stage in nebular condensation to be the precipitation into flocculi of denser matter. 1872 J. S. Cohen Dis. Throat 3 Small quantities of it having coagulated spontaneously into clots or flocculi. 2. Anatomy. A small lobe in the under surface of the cerebellum, immediately behind the middle peduncle; the subpeduncular lobe. ΚΠ 1840 G. V. Ellis Demonstr. Anat. 49 The flocculus, or sub-peduncular lobe. 1872 St. G. Mivart Lessons Elem. Anat. ix. 367. 3. Astronomy. a. Applied to the wisps of luminosity in a nebula. ΘΚΠ the world > the universe > constellation > nebula > [noun] > luminous wisp flocculus1826 1826 Herschel in Mem. Astron. Soc. Lond. II. 491 The flocculi [in the nebula of Orion], instead of being generally round, are drawn out into little wisps. b. One of the small cloudy wisps or masses on the sun's surface, revealed when the sun is photographed with the spectroheliograph. ΘΚΠ the world > the universe > sun > solar activity > [noun] > mark on sun facula1706 rice grain1864 flocculus1903 1903 G. E. Hale in Publ. Yerkes Observ. III. i. 5 I now propose the name flocculi for the regions on the Sun's disk which are shown only on photographs made with the spectroheliograph. 1903 G. E. Hale in Publ. Yerkes Observ. III. i. 14 It is necessary to speak of calcium flocculi, hydrogen flocculi etc. as the..forms of the various vapors in the same part of the disk are not identical. 1915 G. E. Hale Ten Years Wk. Mount. Observ. 20 The spectroheliograph..discloses extensive clouds of calcium, hydrogen, iron, and other vapors, which..are recorded (as flocculi). 1930 R. H. Baker Astron. vii. 291 In the calcium spectroheliograms the flocculi are generally bright, and they are especially conspicuous in the sun-spot zones. 1953 L. H. Aller Astrophysics ix. 341 Elsewhere on the disk are often seen large sinuous dark filaments or dark flocculi, prominences seen in projection. 1967 R. Michard in J. N. Xanthakis Solar Physics v. 116 One can see that these flocculi are organized in a large cellular network..visible mainly on average-quality pictures where the fine structure is smoothed out. This entry has not yet been fully updated (first published 1897; most recently modified version published online March 2022). < n.1799
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