mesocraticadj.

Brit.

/ˌmɛsə(ʊ)ˈkratɪk/, U.S.

/ˌmɛzoʊˈkrædɪk/; see also meso- comb. form.

Origin: Formed within English, by compounding. Etymons: meso- comb. form, -ocratic comb. form.

Etymology: < meso- comb. form + -ocratic comb. form. In sense 2 after leucocratic adj. at leuco- comb. form 1, melanocratic adj.

†1. Of or relating to the middle classes. Obsolete. rare.

ΚΠ

1857 Q. Rev. Oct. 331 Rugby, a local foundation of mere mesocratic origin.

2. Geology. Of a rock: intermediate in composition between leucocratic and melanocratic.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > texture or colour > [adjective] > colour

melanocratic1901

mesocratic1901

leucocratic1909

1901 H. S. Washington in Jrnl. Geol. (Chicago) 9 615 In the covites..the light and dark minerals are present more nearly in the same amount, and these rocks might justly be called ‘mesocratic’.

1954 H. Williams et al. Petrogr. ii. 33 In Johannsen's classification four rock classes are distinguished according to the volume-content of dark minerals, the limits being placed at 5, 50, and 95 percent. Shand also distinguishes four classes, but with different limits, as follows: leucocratic rocks, with less than 30 percent mafic minerals; mesocratic rocks, with 30–60 percent [etc.].

1999 Jrnl. Volcanol. & Geothermal Res. 93 191 The magmatic activity at Trindade was essentially bimodal, generating various ultrabasic rocks and mesocratic to leucocratic phonolites.

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

单词	mesocratic
释义	mesocraticadj. Brit. /ˌmɛsə(ʊ)ˈkratɪk/, U.S. /ˌmɛzoʊˈkrædɪk/; see also meso- comb. form. Origin: Formed within English, by compounding. Etymons: meso- comb. form, -ocratic comb. form. Etymology: < meso- comb. form + -ocratic comb. form. In sense 2 after leucocratic adj. at leuco- comb. form 1, melanocratic adj. †1. Of or relating to the middle classes. Obsolete. rare. ΚΠ 1857 Q. Rev. Oct. 331 Rugby, a local foundation of mere mesocratic origin. 2. Geology. Of a rock: intermediate in composition between leucocratic and melanocratic. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > texture or colour > [adjective] > colour melanocratic1901 mesocratic1901 leucocratic1909 1901 H. S. Washington in Jrnl. Geol. (Chicago) 9 615 In the covites..the light and dark minerals are present more nearly in the same amount, and these rocks might justly be called ‘mesocratic’. 1954 H. Williams et al. Petrogr. ii. 33 In Johannsen's classification four rock classes are distinguished according to the volume-content of dark minerals, the limits being placed at 5, 50, and 95 percent. Shand also distinguishes four classes, but with different limits, as follows: leucocratic rocks, with less than 30 percent mafic minerals; mesocratic rocks, with 30–60 percent [etc.]. 1999 Jrnl. Volcanol. & Geothermal Res. 93 191 The magmatic activity at Trindade was essentially bimodal, generating various ultrabasic rocks and mesocratic to leucocratic phonolites. This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022). < adj.1857
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