round-downn.

Brit.

/ˈraʊndˌdaʊn/, U.S.

/ˈraʊn(d)ˌdaʊn/

Origin: Formed within English, by compounding. Etymons: round n.², down adv.

Etymology: < round n.² + down adv. Compare earlier round-aft n., roundup n. 1.

Nautical.

1. Shipbuilding. A camber in any of the timbers of a sailing ship, esp. in the beams of the deck from one side of the ship to the other.

ΘΚΠ

society > travel > travel by water > vessel, ship, or boat > parts of vessels > body of vessel > [noun] > downwards curvature

hanging1684

round-down1822

hang1850

1822 J. Fincham Direct. laying off Ships 42 (heading) To lay off a round-down and sheer transom.

1841 A. F. B. Creuze Treat. Theory & Pract. Naval Archit. (new ed.) 70/1 To obtain the round-down of the deck at any particular station, take the half-breadth of the ship at that station, [etc.].

1869 E. J. Reed Shipbuilding xii. 241 A stringer angle-iron is worked at the beginning of the round-down in order to form a finish to the deck planking.

1880 J. R. Soley Rep. Foreign Syst. Naval Educ. App. 280 Describe the method of laying off a harpin placed just above the knuckle, and having the same round-down and sheer as the knuckle.

1911 N. J. McDermaid Shipyard Pract. 249 Measure the amount of round down of deck at this point.

1998 J. Teale How to design Boat (ed. 2) viii. 148 Assuming that we wanted to know the round-down at 2ft beam.

2. A section of the flight deck of an aircraft carrier (originally at the aft, but later also forward), shaped to reduce air turbulence on the deck and facilitate landing.

ΚΠ

1931 Irish Times 24 Dec. 8/5 The present type of carrier has a smooth flying deck,..and a ‘round-down’ at one end of the deck to allow the pilot a margin of error in gauging his descent.

1956 J. Gunn Battle in Ice iii. 37 Allan brought the Firefly flashing across the rounddown.

1980 Conway's All World's Fighting Ships 1922–46 17/1 The boiler uptakes were led aft to discharge either side of the round-down.

2004 J. Weber Assured Response xxvii. 299 Gaines was still settling as he approached the carrier's round-down.

This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022).

单词	round-down
释义	round-downn. Brit. /ˈraʊndˌdaʊn/, U.S. /ˈraʊn(d)ˌdaʊn/ Origin: Formed within English, by compounding. Etymons: round n.², down adv. Etymology: < round n.² + down adv. Compare earlier round-aft n., roundup n. 1. Nautical. 1. Shipbuilding. A camber in any of the timbers of a sailing ship, esp. in the beams of the deck from one side of the ship to the other. ΘΚΠ society > travel > travel by water > vessel, ship, or boat > parts of vessels > body of vessel > [noun] > downwards curvature hanging1684 round-down1822 hang1850 1822 J. Fincham Direct. laying off Ships 42 (heading) To lay off a round-down and sheer transom. 1841 A. F. B. Creuze Treat. Theory & Pract. Naval Archit. (new ed.) 70/1 To obtain the round-down of the deck at any particular station, take the half-breadth of the ship at that station, [etc.]. 1869 E. J. Reed Shipbuilding xii. 241 A stringer angle-iron is worked at the beginning of the round-down in order to form a finish to the deck planking. 1880 J. R. Soley Rep. Foreign Syst. Naval Educ. App. 280 Describe the method of laying off a harpin placed just above the knuckle, and having the same round-down and sheer as the knuckle. 1911 N. J. McDermaid Shipyard Pract. 249 Measure the amount of round down of deck at this point. 1998 J. Teale How to design Boat (ed. 2) viii. 148 Assuming that we wanted to know the round-down at 2ft beam. 2. A section of the flight deck of an aircraft carrier (originally at the aft, but later also forward), shaped to reduce air turbulence on the deck and facilitate landing. ΚΠ 1931 Irish Times 24 Dec. 8/5 The present type of carrier has a smooth flying deck,..and a ‘round-down’ at one end of the deck to allow the pilot a margin of error in gauging his descent. 1956 J. Gunn Battle in Ice iii. 37 Allan brought the Firefly flashing across the rounddown. 1980 Conway's All World's Fighting Ships 1922–46 17/1 The boiler uptakes were led aft to discharge either side of the round-down. 2004 J. Weber Assured Response xxvii. 299 Gaines was still settling as he approached the carrier's round-down. This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022). < n.1822
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