polar capn.

Brit.

/ˌpəʊlə ˈkap/, U.S.

/ˌpoʊlər ˈkæp/

Origin: Formed within English, by compounding. Etymons: polar adj., cap n.¹

Etymology: < polar adj. + cap n.¹ (see sense 10 at that entry).

1. A large region of ice or other frozen matter surrounding one or other of a planet's poles.

ΘΚΠ

the world > the universe > planet > [noun] > part of planet

terminator1661

belt1665

fascia1704

fibre1715

white spot1784

dayside1827

nightside1848

albedo1860

north pole1861

polar cap1863

core1882

regolith1897

tectonics1899

sediment ring1955

radiation belt1958

palaeo-radius1960

space needle1961

soil1967

the world > the earth > water > ice > land ice > [noun] > ice-cap or polar ice

inland ice1853

polar cap1863

ice cap1865

calotte1894

1863 H. T. Safford Catal. Standard Polar & Clock Stars 81 It is of the same color as the south polar cap, and is darker than the equatorial belt.

1910 Chambers's Jrnl. Jan. 7/1 Professor Lowell's explanation is that as the northern summer on Mars draws nigh the northern polar cap begins to melt.

1951 S. Chapman Earth's Magn. v. 89 The morphology of magnetic disturbance has been discussed for the belt of the earth lying between (magnetic) latitudes ± 60°. The regions of higher latitude, forming the polar caps, remain to be considered.

1989 J. Silk Big Bang (rev. ed.) xvi. 358 Satellites such as Callisto and Prometheus have polar caps and other prominent ice features.

2003 Detroit Free Press (Nexis) 8 Aug. Have you tried observing Mars with a telescope, yet? Look for the white south polar cap.

2. Cell Biology. An area of differentiated tissue at the pole of a cell, spore, etc.

ΘΚΠ

the world > life > biology > substance > cell > parts of cell > [noun] > regions

polar cap1887

inclusion1890

target1936

periplasm1961

1887 Amer. Naturalist 21 140 The special protoplasm sheet lining the nucleus is amœboid, as is also the nucleolus. The former..gathers as two polar caps (j), while the latter dissolves to granules.

1904 Bot. Gaz. 37 204 (caption) A longitudinal section of a periblem cell drawn at upper and lower focus, showing the appearance of hyaline polar caps.

1950 L. E. Hawker Physiol. Fungi ii. 25 When growth is limited to the apex, it is probable that the cell wall has become rigid except for a polar cap which continues to grow.

1968 R. Rasmont in M. Florkin & B. T. Scheer Chem. Zool. II. i. vi. 68 Ribonucleic acid in the polar caps of the platelets.

2000 Evol. & Devel. 2 261 The protein and RNA become somewhat concentrated at the egg cortex and in the posterior polar cap of the oocyte.

This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).

单词	polar cap
释义	polar capn. Brit. /ˌpəʊlə ˈkap/, U.S. /ˌpoʊlər ˈkæp/ Origin: Formed within English, by compounding. Etymons: polar adj., cap n.¹ Etymology: < polar adj. + cap n.¹ (see sense 10 at that entry). 1. A large region of ice or other frozen matter surrounding one or other of a planet's poles. ΘΚΠ the world > the universe > planet > [noun] > part of planet terminator1661 belt1665 fascia1704 fibre1715 white spot1784 dayside1827 nightside1848 albedo1860 north pole1861 polar cap1863 core1882 regolith1897 tectonics1899 sediment ring1955 radiation belt1958 palaeo-radius1960 space needle1961 soil1967 the world > the earth > water > ice > land ice > [noun] > ice-cap or polar ice inland ice1853 polar cap1863 ice cap1865 calotte1894 1863 H. T. Safford Catal. Standard Polar & Clock Stars 81 It is of the same color as the south polar cap, and is darker than the equatorial belt. 1910 Chambers's Jrnl. Jan. 7/1 Professor Lowell's explanation is that as the northern summer on Mars draws nigh the northern polar cap begins to melt. 1951 S. Chapman Earth's Magn. v. 89 The morphology of magnetic disturbance has been discussed for the belt of the earth lying between (magnetic) latitudes ± 60°. The regions of higher latitude, forming the polar caps, remain to be considered. 1989 J. Silk Big Bang (rev. ed.) xvi. 358 Satellites such as Callisto and Prometheus have polar caps and other prominent ice features. 2003 Detroit Free Press (Nexis) 8 Aug. Have you tried observing Mars with a telescope, yet? Look for the white south polar cap. 2. Cell Biology. An area of differentiated tissue at the pole of a cell, spore, etc. ΘΚΠ the world > life > biology > substance > cell > parts of cell > [noun] > regions polar cap1887 inclusion1890 target1936 periplasm1961 1887 Amer. Naturalist 21 140 The special protoplasm sheet lining the nucleus is amœboid, as is also the nucleolus. The former..gathers as two polar caps (j), while the latter dissolves to granules. 1904 Bot. Gaz. 37 204 (caption) A longitudinal section of a periblem cell drawn at upper and lower focus, showing the appearance of hyaline polar caps. 1950 L. E. Hawker Physiol. Fungi ii. 25 When growth is limited to the apex, it is probable that the cell wall has become rigid except for a polar cap which continues to grow. 1968 R. Rasmont in M. Florkin & B. T. Scheer Chem. Zool. II. i. vi. 68 Ribonucleic acid in the polar caps of the platelets. 2000 Evol. & Devel. 2 261 The protein and RNA become somewhat concentrated at the egg cortex and in the posterior polar cap of the oocyte. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < n.1863
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