alidaden.

Brit.

/ˈalᵻdeɪd/,

/ˈalᵻdad/, U.S.

/ˈæləˌdeɪd/,

/ˈæləˌdæd/

Forms:

α. late Middle English allydatha, 1500s alhydada, 1500s–1600s allidatha, 1500s–1700s alhidada, 1600s alhadida.

β. 1600s alhidad, 1600s–1800s alhidade, 1600s– alidade, 1700s– alidad.

γ. 1500s alydeday, 1500s atheldaye, 1500s athelida, 1500s atheliday, 1500s athelyday, 1500s athladaie.

Origin: Of multiple origins. Partly a borrowing from Latin. Partly a borrowing from French. Etymons: Latin allidada; French alidade, alhidade.

Etymology: Originally (in α. forms) < post-classical Latin allidada, alhidada (13th cent.; 14th cent. in British sources; > Middle French alhidada , alidada (both 1544)) < Arabic al-ʿiḍāda < al the + ʿiḍāda each of the two front and back movable parts of an astrolabe, specific use of ʿiḍāda side of a door, each of two parallel doorposts < ʿaḍada to support. In later use (in β. forms) < French alidade (1362 in Middle French; also †alhidade (1621); < post-classical Latin allidada). Compare Spanish alidada, †alidada, †alhadida (all c1277), Italian alidada (1578).The medial -h- in forms in various European languages probably reflects the initial ʿayn of the Arabic noun. The origin of the γ. forms, which apparently occur only in the works of W. Bourne, is unexplained; it has been suggested that they may reflect association with theodolite n.

A pivoted sighting device or pointer which can be aligned against a circular scale of degrees and typically forms part of an astrolabe, plane table, or similar instrument. Cf. index n. 2b.

ΘΚΠ

the world > the universe > cosmology > science of observation > astronomical instruments > [noun]

musterc1450

alidadea1500

the world > the universe > cosmology > science of observation > astronomical instruments > [noun] > parts of

almuryc1400

alidadea1500

diopter1594

pinnule1594

a1500 Chaucer's Treat. Astrolabe: Insertion (BL Add. 23002) (1872) 81 Ley thy rewle of thy astrolabye, that is to sey, the allydatha [1561 allidatha], vpon þe day in the kalendre off the Astrolabye, & he schall schewe the thy degree of the sonne.

?a1560 L. Digges Geom. Pract.: Pantometria (1571) i. xxix. sig. Iiij Note bothe what degrees the Alhidada cutteth of the circle, and the perpendiculare of the semicircle.

1578 W. Bourne Treasure for Traueilers i. ii. f. 5 Now if that you wyl know, the height of any Towne or vpright wal, doe thus turne the Athelida C. to the corner of the Scall, and set it vpon the parte 12.

1679 J. Moxon Math. made Easie 5 Alhadida..a word seldom used by English authors..signifies only the Label or Index that moves upon the centre-pin of an Astrolabe.

1728 tr. A.-J. Dézallier d'Argenville Theory & Pract. Gardening (ed. 2) ii. i. 104 Describe it truly upon the Ground in like Proportion, by opening the Semicircle and setting the Alhidade or Moveable Index on the same Number of Degrees.

1765 Philos. Trans. 1764 (Royal Soc.) 54 162 Moved in the limb by a vertical motion in either direction by the alidad alone.

1834 Nat. Philos. (Libr. Useful Knowl.) III. xiii. 66/1 Morin went so far as..to attach a telescope to the alhidade of what he calls a planisphere.

1837 W. Whewell Hist. Inductive Sci. I. 231 The alidad of an instrument is its index, which possesses an angular motion.

1951 H. Wouk Caine Mutiny (1952) v. xx. 238 Urgan, at the port alidade, called out, ‘Left tangent Roi, 064.’.. He put his eye to the alidade.

1984 D. Hill Hist. Engin. Classical & Medieval Times (1996) vii. 120 For everyday use in measuring angles, a simple rotatable alidade provided with a scale of angles was probably the normal instrument.

2009 U. McGovern & P. Jenner Lost Lore 270 During the day, the astrolabe would be held below eye level, the alidad again turned until a ray of sunlight was sighted and the angle read.

This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021).

单词	alidade
释义	alidaden. Brit. /ˈalᵻdeɪd/, /ˈalᵻdad/, U.S. /ˈæləˌdeɪd/, /ˈæləˌdæd/ Forms: α. late Middle English allydatha, 1500s alhydada, 1500s–1600s allidatha, 1500s–1700s alhidada, 1600s alhadida. β. 1600s alhidad, 1600s–1800s alhidade, 1600s– alidade, 1700s– alidad. γ. 1500s alydeday, 1500s atheldaye, 1500s athelida, 1500s atheliday, 1500s athelyday, 1500s athladaie. Origin: Of multiple origins. Partly a borrowing from Latin. Partly a borrowing from French. Etymons: Latin allidada; French alidade, alhidade. Etymology: Originally (in α. forms) < post-classical Latin allidada, alhidada (13th cent.; 14th cent. in British sources; > Middle French alhidada , alidada (both 1544)) < Arabic al-ʿiḍāda < al the + ʿiḍāda each of the two front and back movable parts of an astrolabe, specific use of ʿiḍāda side of a door, each of two parallel doorposts < ʿaḍada to support. In later use (in β. forms) < French alidade (1362 in Middle French; also †alhidade (1621); < post-classical Latin allidada). Compare Spanish alidada, †alidada, †alhadida (all c1277), Italian alidada (1578).The medial -h- in forms in various European languages probably reflects the initial ʿayn of the Arabic noun. The origin of the γ. forms, which apparently occur only in the works of W. Bourne, is unexplained; it has been suggested that they may reflect association with theodolite n. A pivoted sighting device or pointer which can be aligned against a circular scale of degrees and typically forms part of an astrolabe, plane table, or similar instrument. Cf. index n. 2b. ΘΚΠ the world > the universe > cosmology > science of observation > astronomical instruments > [noun] musterc1450 alidadea1500 the world > the universe > cosmology > science of observation > astronomical instruments > [noun] > parts of almuryc1400 alidadea1500 diopter1594 pinnule1594 a1500 Chaucer's Treat. Astrolabe: Insertion (BL Add. 23002) (1872) 81 Ley thy rewle of thy astrolabye, that is to sey, the allydatha [1561 allidatha], vpon þe day in the kalendre off the Astrolabye, & he schall schewe the thy degree of the sonne. ?a1560 L. Digges Geom. Pract.: Pantometria (1571) i. xxix. sig. Iiij Note bothe what degrees the Alhidada cutteth of the circle, and the perpendiculare of the semicircle. 1578 W. Bourne Treasure for Traueilers i. ii. f. 5 Now if that you wyl know, the height of any Towne or vpright wal, doe thus turne the Athelida C. to the corner of the Scall, and set it vpon the parte 12. 1679 J. Moxon Math. made Easie 5 Alhadida..a word seldom used by English authors..signifies only the Label or Index that moves upon the centre-pin of an Astrolabe. 1728 tr. A.-J. Dézallier d'Argenville Theory & Pract. Gardening (ed. 2) ii. i. 104 Describe it truly upon the Ground in like Proportion, by opening the Semicircle and setting the Alhidade or Moveable Index on the same Number of Degrees. 1765 Philos. Trans. 1764 (Royal Soc.) 54 162 Moved in the limb by a vertical motion in either direction by the alidad alone. 1834 Nat. Philos. (Libr. Useful Knowl.) III. xiii. 66/1 Morin went so far as..to attach a telescope to the alhidade of what he calls a planisphere. 1837 W. Whewell Hist. Inductive Sci. I. 231 The alidad of an instrument is its index, which possesses an angular motion. 1951 H. Wouk Caine Mutiny (1952) v. xx. 238 Urgan, at the port alidade, called out, ‘Left tangent Roi, 064.’.. He put his eye to the alidade. 1984 D. Hill Hist. Engin. Classical & Medieval Times (1996) vii. 120 For everyday use in measuring angles, a simple rotatable alidade provided with a scale of angles was probably the normal instrument. 2009 U. McGovern & P. Jenner Lost Lore 270 During the day, the astrolabe would be held below eye level, the alidad again turned until a ray of sunlight was sighted and the angle read. This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021). < n.a1500
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