powder-downn.

Brit.

/ˈpaʊdədaʊn/, U.S.

/ˈpaʊdərˌdaʊn/

Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: powder n.¹, down n.²

Etymology: < powder n.¹ + down n.², after German Puder-dune ( C. L. Nitzsch System der Pterylographie (1840) vii. 52, as plural Puder-dunen , alongside Staub-dunen in the same sense) < Puder ( < French poudre powder n.¹) + Dune , variant of Daune (see down n.²) .

Ornithology.

A down feather which grows continuously and disintegrates into a powder at the tips instead of being moulted (more fully powder-down feather); such feathers collectively, which occur in patches on certain birds, as herons, toucans, parrots, and bowerbirds, the powder being used in cleaning the plumage.

ΘΚΠ

the world > animals > birds > feather > [noun] > down or down-feather

plumeOE

down1345

dowlc1535

plumule1782

powder-down1861

1861 Proc. Zool. Soc. 131 This has led me to the discovery of two remarkable powder-down patches.

1894 A. Newton et al. Dict. Birds: Pt. III 738 Powder-downs are so called from the powder produced by the continuous disintegration of the numerous brush-like barbs and barbules, into which the barrel is constantly splitting as it grows without forming a principal shaft.

a1933 J. A. Thomson Biol. for Everyman (1934) I. xx. 532 Apparently derivable from the plumule type are the curious ‘powder-downs’, well seen on the breast of herons and bitterns, also in tufts on morepork (Podargus), rollers, and parrots.

1957 D. A. Bannerman Birds Brit. Isles VI. 124 In a study of the functions of these powder-down patches..Lord William Percy found that these patches were common to both herons and bitterns, the herons and egrets possessing three pairs of powder-puffs, the bitterns only two pairs.

1987 E. W. Burr Compan. Bird Med. viii. 43 (caption) The beak has an abnormal glossy sheen due to destruction of powder down feathers.

2004 Post-Crescent (Wisconsin) (Nexis) 18 Aug. 5/2 Another feature that caught our attention was the heron's powder-downs, special types of feathers that are never shed. Rather they fray at the tips into a powdery material used for dressing their feathers.

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

单词	powder-down
释义	powder-downn. Brit. /ˈpaʊdədaʊn/, U.S. /ˈpaʊdərˌdaʊn/ Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: powder n.¹, down n.² Etymology: < powder n.¹ + down n.², after German Puder-dune ( C. L. Nitzsch System der Pterylographie (1840) vii. 52, as plural Puder-dunen , alongside Staub-dunen in the same sense) < Puder ( < French poudre powder n.¹) + Dune , variant of Daune (see down n.²) . Ornithology. A down feather which grows continuously and disintegrates into a powder at the tips instead of being moulted (more fully powder-down feather); such feathers collectively, which occur in patches on certain birds, as herons, toucans, parrots, and bowerbirds, the powder being used in cleaning the plumage. ΘΚΠ the world > animals > birds > feather > [noun] > down or down-feather plumeOE down1345 dowlc1535 plumule1782 powder-down1861 1861 Proc. Zool. Soc. 131 This has led me to the discovery of two remarkable powder-down patches. 1894 A. Newton et al. Dict. Birds: Pt. III 738 Powder-downs are so called from the powder produced by the continuous disintegration of the numerous brush-like barbs and barbules, into which the barrel is constantly splitting as it grows without forming a principal shaft. a1933 J. A. Thomson Biol. for Everyman (1934) I. xx. 532 Apparently derivable from the plumule type are the curious ‘powder-downs’, well seen on the breast of herons and bitterns, also in tufts on morepork (Podargus), rollers, and parrots. 1957 D. A. Bannerman Birds Brit. Isles VI. 124 In a study of the functions of these powder-down patches..Lord William Percy found that these patches were common to both herons and bitterns, the herons and egrets possessing three pairs of powder-puffs, the bitterns only two pairs. 1987 E. W. Burr Compan. Bird Med. viii. 43 (caption) The beak has an abnormal glossy sheen due to destruction of powder down feathers. 2004 Post-Crescent (Wisconsin) (Nexis) 18 Aug. 5/2 Another feature that caught our attention was the heron's powder-downs, special types of feathers that are never shed. Rather they fray at the tips into a powdery material used for dressing their feathers. This entry has been updated (OED Third Edition, December 2006; most recently modified version published online June 2022). < n.1861
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