microthermn.adj.

Brit.

/ˈmʌɪkrə(ʊ)θəːm/, U.S.

/ˈmaɪkroʊˌθərm/,

/ˈmaɪkrəˌθərm/

Origin: Formed within English, by compounding; modelled on a French lexical item. Etymons: micro- comb. form, -therm comb. form.

Etymology: < micro- comb. form + -therm comb. form, after French microtherme (A. de Candolle 1874, in Arch. des sci. physiques et nat. 50 13).

Ecology.

A. n.

A plant (or other organism) that can grow or survive in a cold environment.

ΘΚΠ

the world > plants > by habitat or distribution > [noun] > that grow in cold environments or at high altitude

alpestral1706

Alpine1800

microtherm1874

hekistotherm1875

cryophyte1909

1874 Nature 9 July 192/1 The fourth group [of plants in de Candolle's classification]..are named Microtherms.

1875 J. G. Baker Elem. Lessons Bot. Geogr. 50 The seeds of many of the Microtherms..will germinate at a temperature of little over 32°.

1900 B. D. Jackson Gloss. Bot. Terms Microtherm.

1960 N. Polunin Introd. Plant Geogr. x. 285 The great world vegetal zones..depend primarily on temperature, and we find it convenient to distinguish between megatherms (plants favouring warm habitats), microtherms (plants favouring cold habitats), and the intermediate mesotherms.

1989 Ann. Rev. Ecol. & Systematics 20 30 Thermal adaptations of the Australian flora have been classified into three broad groups: megatherms with a thermal optimum around 28°C, mesotherms in the 18-22°C range, and microtherms in the 10-12°C range.

B. adj.

Designating a microtherm. Also: = microthermal adj. 3.

ΘΚΠ

the world > plants > by habitat or distribution > [adjective] > that grow in cold environments or at high altitude

uplandish1545

upland1639

alpestrine1787

alpestral1852

nival1884

microthermal1901

microthermic1903

microtherm1964

1964 Proc. Royal Soc. B. 161 9 The species of the eccentric genera..are microtherm throughout their range.

1969 Jrnl. Animal Ecol. 38 1p Many specialized microtherm offshoots [of tropical rain-forest groups].

1982 Jrnl. Biogeogr. 9 171/2 Pollen of the microtherm genus Laurembergia.

1997 Functional Ecol. 11 781 (caption) A gradation from microtherm Fuegian beech forest to more extreme microtherm maritime steppe.

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

单词	microtherm
释义	microthermn.adj. Brit. /ˈmʌɪkrə(ʊ)θəːm/, U.S. /ˈmaɪkroʊˌθərm/, /ˈmaɪkrəˌθərm/ Origin: Formed within English, by compounding; modelled on a French lexical item. Etymons: micro- comb. form, -therm comb. form. Etymology: < micro- comb. form + -therm comb. form, after French microtherme (A. de Candolle 1874, in Arch. des sci. physiques et nat. 50 13). Ecology. A. n. A plant (or other organism) that can grow or survive in a cold environment. ΘΚΠ the world > plants > by habitat or distribution > [noun] > that grow in cold environments or at high altitude alpestral1706 Alpine1800 microtherm1874 hekistotherm1875 cryophyte1909 1874 Nature 9 July 192/1 The fourth group [of plants in de Candolle's classification]..are named Microtherms. 1875 J. G. Baker Elem. Lessons Bot. Geogr. 50 The seeds of many of the Microtherms..will germinate at a temperature of little over 32°. 1900 B. D. Jackson Gloss. Bot. Terms Microtherm. 1960 N. Polunin Introd. Plant Geogr. x. 285 The great world vegetal zones..depend primarily on temperature, and we find it convenient to distinguish between megatherms (plants favouring warm habitats), microtherms (plants favouring cold habitats), and the intermediate mesotherms. 1989 Ann. Rev. Ecol. & Systematics 20 30 Thermal adaptations of the Australian flora have been classified into three broad groups: megatherms with a thermal optimum around 28°C, mesotherms in the 18-22°C range, and microtherms in the 10-12°C range. B. adj. Designating a microtherm. Also: = microthermal adj. 3. ΘΚΠ the world > plants > by habitat or distribution > [adjective] > that grow in cold environments or at high altitude uplandish1545 upland1639 alpestrine1787 alpestral1852 nival1884 microthermal1901 microthermic1903 microtherm1964 1964 Proc. Royal Soc. B. 161 9 The species of the eccentric genera..are microtherm throughout their range. 1969 Jrnl. Animal Ecol. 38 1p Many specialized microtherm offshoots [of tropical rain-forest groups]. 1982 Jrnl. Biogeogr. 9 171/2 Pollen of the microtherm genus Laurembergia. 1997 Functional Ecol. 11 781 (caption) A gradation from microtherm Fuegian beech forest to more extreme microtherm maritime steppe. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < n.adj.1874
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