abaxialadj.

Brit.

/aˈbaksɪəl/, U.S.

/æˈbæksiəl/

Origin: Formed within English, by derivation. Etymons: ab- prefix, axis n.¹, -al suffix¹.

Etymology: < ab- prefix + axis n.¹ + -al suffix¹. Compare post-classical Latin abaxialis (1839 or earlier). Compare adaxial adj. Compare also earlier uniaxial adj. and later axial adj.

Chiefly Botany.

1. Designating the surface of an organ, esp. a leaf, which during development initially faces away from the main axis or stem (usually the underside or outer surface); of or relating to such a surface; (formerly also) †designating that which is situated below the main axis (obsolete). Frequently opposed to adaxial. Cf. dorsal adj. 2b.

ΘΚΠ

the world > plants > part of plant > (defined by) distribution, arrangement, or position > [adjective] > of surface position

ventral1832

abaxial1835

adaxial1835

1835 G. T. Burnett Outl. Bot. II. 984 The germen is formed of two incumbent carpels, i.e. adaxial and abaxial in their position.

1884 R. R. Wright et al. Contrib. Anat. Amiurus 339 The terms abaxial and axial refer to the surfaces of the rays looking respectively towards or away from the axis of the body.

1918 Jrnl. Agric. Res. 14 224 The petiole is semicircular in cross section. The adaxial side is slightly concave, the abaxial side strongly convex.

1979 Nature 22 Nov. 425/2 Abaxial and adaxial patterns of stomatal response to light.

2006 Plant Cell 18 1143/1 The abaxial nature of the filamentous leaves was evident.

†2. Esp. of a plant embryo: positioned off the main axis or central line; = abaxile adj. 1 Frequently opposed to axial. Obsolete.

ΚΠ

1847 A. Henfrey Outl. Struct. & Physiol. Bot. 213 The embryo may lie out of the axis, being most distant from the side where the chalaza is situated..; it is then abaxial.

1855 Proc. Bot. Soc. Edinb. Dec. 58 A Phyllogen consists normally of two parts—1st. An axial portion, the underground part of which is called the root, the aerial, the stem. 2d. An abaxial portion,—a structure developed normally at an angle to the axis of the plant or a leaf.

1877 A. Silver Outl. Elem. Bot. (rev. ed.) 169 With regard to the position of the embryo, it either occupies the centre of the kernel, when it is said to be axial, or it is out of it (abaxial or eccentric).

This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021).

单词	abaxial
释义	abaxialadj. Brit. /aˈbaksɪəl/, U.S. /æˈbæksiəl/ Origin: Formed within English, by derivation. Etymons: ab- prefix, axis n.¹, -al suffix¹. Etymology: < ab- prefix + axis n.¹ + -al suffix¹. Compare post-classical Latin abaxialis (1839 or earlier). Compare adaxial adj. Compare also earlier uniaxial adj. and later axial adj. Chiefly Botany. 1. Designating the surface of an organ, esp. a leaf, which during development initially faces away from the main axis or stem (usually the underside or outer surface); of or relating to such a surface; (formerly also) †designating that which is situated below the main axis (obsolete). Frequently opposed to adaxial. Cf. dorsal adj. 2b. ΘΚΠ the world > plants > part of plant > (defined by) distribution, arrangement, or position > [adjective] > of surface position ventral1832 abaxial1835 adaxial1835 1835 G. T. Burnett Outl. Bot. II. 984 The germen is formed of two incumbent carpels, i.e. adaxial and abaxial in their position. 1884 R. R. Wright et al. Contrib. Anat. Amiurus 339 The terms abaxial and axial refer to the surfaces of the rays looking respectively towards or away from the axis of the body. 1918 Jrnl. Agric. Res. 14 224 The petiole is semicircular in cross section. The adaxial side is slightly concave, the abaxial side strongly convex. 1979 Nature 22 Nov. 425/2 Abaxial and adaxial patterns of stomatal response to light. 2006 Plant Cell 18 1143/1 The abaxial nature of the filamentous leaves was evident. †2. Esp. of a plant embryo: positioned off the main axis or central line; = abaxile adj. 1 Frequently opposed to axial. Obsolete. ΚΠ 1847 A. Henfrey Outl. Struct. & Physiol. Bot. 213 The embryo may lie out of the axis, being most distant from the side where the chalaza is situated..; it is then abaxial. 1855 Proc. Bot. Soc. Edinb. Dec. 58 A Phyllogen consists normally of two parts—1st. An axial portion, the underground part of which is called the root, the aerial, the stem. 2d. An abaxial portion,—a structure developed normally at an angle to the axis of the plant or a leaf. 1877 A. Silver Outl. Elem. Bot. (rev. ed.) 169 With regard to the position of the embryo, it either occupies the centre of the kernel, when it is said to be axial, or it is out of it (abaxial or eccentric). This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021). < adj.1835
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