metaxylemn.

Brit.

/mɛtəˈzʌɪləm/, U.S.

/ˌmɛdəˈzaɪl(ə)m/

Origin: Formed within English, by derivation; modelled on a French lexical item. Etymons: meta- prefix, xylem n.

Etymology: < meta- prefix + xylem n., after French métaxylème (1887 P. E. L. van Tieghem, in Bull. de la Soc. Botanique de France 34 103).

Botany.

The later-formed part of the primary xylem, maturing after elongation of the plant tissue is complete and distinguished by the presence of pitted tracheary elements. Cf. metaphloem n.

ΘΚΠ

the world > plants > part of plant > cell or aggregate tissue > [noun] > tissue > xylem or phloem

liber1753

phloem1872

xylem1875

protophloem1884

protoxylem1887

internal phloem1891

metaxylem1894

hadrome1898

leptome1898

metaphloem1900

included phloem1910

1894 R. J. H. Gibson in Ann. Bot. 8 194 There also exists a single cylindrical stele with protoxylems on the outer border of the metaxylem, which are the points of intersection of the leaf-traces.

1902 Encycl. Brit. XXV. 415/1 Sometimes..the centre of a bulky root stele has strands of metaxylem..scattered through it.

1965 K. Esau Plant Anat. (ed. 2) xi. 243 The metaxylem, which appears after the protoxylem, is in the process of differentiation while the shoot is elongating.

1992 M. Ingrouille Diversity & Evol. Land Plants 30 In the stem the protoxylem is located inside the metaxylem, a distribution called endarch.

This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).

单词	metaxylem
释义	metaxylemn. Brit. /mɛtəˈzʌɪləm/, U.S. /ˌmɛdəˈzaɪl(ə)m/ Origin: Formed within English, by derivation; modelled on a French lexical item. Etymons: meta- prefix, xylem n. Etymology: < meta- prefix + xylem n., after French métaxylème (1887 P. E. L. van Tieghem, in Bull. de la Soc. Botanique de France 34 103). Botany. The later-formed part of the primary xylem, maturing after elongation of the plant tissue is complete and distinguished by the presence of pitted tracheary elements. Cf. metaphloem n. ΘΚΠ the world > plants > part of plant > cell or aggregate tissue > [noun] > tissue > xylem or phloem liber1753 phloem1872 xylem1875 protophloem1884 protoxylem1887 internal phloem1891 metaxylem1894 hadrome1898 leptome1898 metaphloem1900 included phloem1910 1894 R. J. H. Gibson in Ann. Bot. 8 194 There also exists a single cylindrical stele with protoxylems on the outer border of the metaxylem, which are the points of intersection of the leaf-traces. 1902 Encycl. Brit. XXV. 415/1 Sometimes..the centre of a bulky root stele has strands of metaxylem..scattered through it. 1965 K. Esau Plant Anat. (ed. 2) xi. 243 The metaxylem, which appears after the protoxylem, is in the process of differentiation while the shoot is elongating. 1992 M. Ingrouille Diversity & Evol. Land Plants 30 In the stem the protoxylem is located inside the metaxylem, a distribution called endarch. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < n.1894
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