ubacn.

Brit.

/ˈuːbak/, U.S.

/ˈubæk/

Origin: A borrowing from French. Etymon: French ubac.

Etymology: < French ubac (1907; originally French regional (south-eastern)) < Old Occitan, Occitan ubac (1431) < classical Latin opācus shady (see opaque adj.). Compare post-classical Latin ubacum (in an undated source in Du Cange), ubagum (1035), Catalan obac (839 as obago, 1371 as ubac), Middle French ubac situated in the shade (1505).

Geography.

A hillside or mountain slope which receives little sunshine, esp. (in the northern hemisphere) a north-facing one. Chiefly with reference to the Alps. Frequently attributive.Contrasted with adret.

ΘΚΠ

the world > the earth > land > landscape > high land > mountain > [noun] > side

mountainsidea1425

face1632

talus1830

versant1851

adret1922

ubac1922

1922 Geogr. Jrnl. 59 310 In the upper Val de Conches..it is found that 57 per cent. of the unproductive area and 61 per cent. of the forested area lie within the ubac.

1937 A. Garnett Insolation & Relief (Inst. of Brit. Geographers Publ. No. 5) i. 4 While ubac air temperatures may be 2 degrees lower in winter than the adret air temperatures, this difference diminishes in summer to zero, and may in some cases give ubac air temperatures that are even slightly warmer.

1963 D. W. Humphries & E. E. Humphries tr. H. Termier & G. Termier Erosion & Sedimentation ii. 38 Given that a more rapid thawing occurs on the adret than on the ubac solifluction is most strongly developed on the less sunny slope.

2000 A. Jones & D. Crook in G. Barker Archaeol. Drylands xvii. 317 South-facing adret slopes receive 50 per cent more sunshine than north-facing ubac slopes.

This is a new entry (OED Third Edition, June 2005; most recently modified version published online March 2022).

单词	ubac
释义	ubacn. Brit. /ˈuːbak/, U.S. /ˈubæk/ Origin: A borrowing from French. Etymon: French ubac. Etymology: < French ubac (1907; originally French regional (south-eastern)) < Old Occitan, Occitan ubac (1431) < classical Latin opācus shady (see opaque adj.). Compare post-classical Latin ubacum (in an undated source in Du Cange), ubagum (1035), Catalan obac (839 as obago, 1371 as ubac), Middle French ubac situated in the shade (1505). Geography. A hillside or mountain slope which receives little sunshine, esp. (in the northern hemisphere) a north-facing one. Chiefly with reference to the Alps. Frequently attributive.Contrasted with adret. ΘΚΠ the world > the earth > land > landscape > high land > mountain > [noun] > side mountainsidea1425 face1632 talus1830 versant1851 adret1922 ubac1922 1922 Geogr. Jrnl. 59 310 In the upper Val de Conches..it is found that 57 per cent. of the unproductive area and 61 per cent. of the forested area lie within the ubac. 1937 A. Garnett Insolation & Relief (Inst. of Brit. Geographers Publ. No. 5) i. 4 While ubac air temperatures may be 2 degrees lower in winter than the adret air temperatures, this difference diminishes in summer to zero, and may in some cases give ubac air temperatures that are even slightly warmer. 1963 D. W. Humphries & E. E. Humphries tr. H. Termier & G. Termier Erosion & Sedimentation ii. 38 Given that a more rapid thawing occurs on the adret than on the ubac solifluction is most strongly developed on the less sunny slope. 2000 A. Jones & D. Crook in G. Barker Archaeol. Drylands xvii. 317 South-facing adret slopes receive 50 per cent more sunshine than north-facing ubac slopes. This is a new entry (OED Third Edition, June 2005; most recently modified version published online March 2022). < n.1922
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