mestomen.

Brit.

/ˈmɛstəʊm/, U.S.

/ˈmɛsˌtoʊm/

Forms: 1800s– mestom, 1800s– mestome.

Origin: A borrowing from German. Etymon: German Mestom.

Etymology: < German Mestom ( S. Schwendener Das mechanische Princip in Anat. Bau der Monocotylen (1874) p. v) < ancient Greek μέστωμα (taken in the sense ‘filling up’) < μεστοῦν to fill up ( < μεστός full, of unknown origin) + -ωμα -oma comb. form. Compare stereome n.

Botany.

The conducting elements and associated parenchyma of a vascular bundle (as opposed to the strengthening mechanical elements). Now historical.

ΚΠ

1885 G. L. Goodale in A. Gray & G. L. Goodale Bot. Text-bk. (ed. 6) II. i. v. 191 To the elements which impart strength to a bundle Schwendener has given the name stereom; to the other parts of the bundle, mestom; thus the fibres are stereom elements, the ducts are mestom elements.

1898 H. C. Porter tr. E. Strasburger et al. Text-bk. Bot. 102 Other terms often used to designate the vascular bundles are folio-vascular bundles and mestome. The vascular portion is also termed the xylem or hadrome.

1925 A. J. Eames & L. H. MacDaniels Introd. Plant Anat. iv. 51 The supporting and protecting cells are known collectively as stereome, the hard tissue; the conducting and packing tissues as the mestome.

1965 K. Esau Plant Anat. (ed. 2) xvi. 440 The thick-walled sheath was termed mestom sheath by Schwendener, because mestom was previously used to designate the conducting elements of a vascular bundle.

Compounds

mestome sheath n. [after German Mestomscheide (S. Schwendener 1890, in Sitzungsber. der Preuss. Akad. der Wissensch.: Phys.-Math. Kl. 22 405) < Mestom mestome n. + Scheide (see sheath n.¹)] a sheath of relatively thick-walled cells, without chloroplasts, situated within the parenchymatous bundle sheath in certain grasses (in quot. 1925 used mistakenly for the parenchymatous sheath).

ΚΠ

1925 A. J. Eames & L. H. MacDaniels Introd. Plant Anat. xii. 276 The outer sheath, often known as the mestome sheath, is made up of thin-walled parenchyma cells.

1965 K. Esau Plant Anat. (ed. 2) xvi. 440 If present, the mestom sheath occurs next to the vascular tissue, and outside it is a second thin-walled sheath with chloroplasts.

1985 New Phytologist 101 495 Fungal haustoria occurred in cells of the mesophyll, parenchymatous bundle sheath and epidermis (excluding guard cells) but not within the mestome sheath or vascular bundles.

1995 Austral. Jrnl. Plant Physiol. 22 521 Sedges..possess a suberised lamella in photosynthetic organs which is invariably present in and confined to the mestome sheath cell walls.

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

单词	mestome
释义	mestomen. Brit. /ˈmɛstəʊm/, U.S. /ˈmɛsˌtoʊm/ Forms: 1800s– mestom, 1800s– mestome. Origin: A borrowing from German. Etymon: German Mestom. Etymology: < German Mestom ( S. Schwendener Das mechanische Princip in Anat. Bau der Monocotylen (1874) p. v) < ancient Greek μέστωμα (taken in the sense ‘filling up’) < μεστοῦν to fill up ( < μεστός full, of unknown origin) + -ωμα -oma comb. form. Compare stereome n. Botany. The conducting elements and associated parenchyma of a vascular bundle (as opposed to the strengthening mechanical elements). Now historical. ΚΠ 1885 G. L. Goodale in A. Gray & G. L. Goodale Bot. Text-bk. (ed. 6) II. i. v. 191 To the elements which impart strength to a bundle Schwendener has given the name stereom; to the other parts of the bundle, mestom; thus the fibres are stereom elements, the ducts are mestom elements. 1898 H. C. Porter tr. E. Strasburger et al. Text-bk. Bot. 102 Other terms often used to designate the vascular bundles are folio-vascular bundles and mestome. The vascular portion is also termed the xylem or hadrome. 1925 A. J. Eames & L. H. MacDaniels Introd. Plant Anat. iv. 51 The supporting and protecting cells are known collectively as stereome, the hard tissue; the conducting and packing tissues as the mestome. 1965 K. Esau Plant Anat. (ed. 2) xvi. 440 The thick-walled sheath was termed mestom sheath by Schwendener, because mestom was previously used to designate the conducting elements of a vascular bundle. Compounds mestome sheath n. [after German Mestomscheide (S. Schwendener 1890, in Sitzungsber. der Preuss. Akad. der Wissensch.: Phys.-Math. Kl. 22 405) < Mestom mestome n. + Scheide (see sheath n.¹)] a sheath of relatively thick-walled cells, without chloroplasts, situated within the parenchymatous bundle sheath in certain grasses (in quot. 1925 used mistakenly for the parenchymatous sheath). ΚΠ 1925 A. J. Eames & L. H. MacDaniels Introd. Plant Anat. xii. 276 The outer sheath, often known as the mestome sheath, is made up of thin-walled parenchyma cells. 1965 K. Esau Plant Anat. (ed. 2) xvi. 440 If present, the mestom sheath occurs next to the vascular tissue, and outside it is a second thin-walled sheath with chloroplasts. 1985 New Phytologist 101 495 Fungal haustoria occurred in cells of the mesophyll, parenchymatous bundle sheath and epidermis (excluding guard cells) but not within the mestome sheath or vascular bundles. 1995 Austral. Jrnl. Plant Physiol. 22 521 Sedges..possess a suberised lamella in photosynthetic organs which is invariably present in and confined to the mestome sheath cell walls. This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022). < n.1885
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