rudaceousadj.

Brit.

/rᵿˈdeɪʃəs/, U.S.

/ruˈdeɪʃəs/

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin rūdus , -aceous suffix.

Etymology: < classical Latin rūdus rubble (see rudera n.) + -aceous suffix.

Geology.

Of a clastic sedimentary rock: composed of grains coarser than sand, i.e. greater than 2 mm (approx. ¹/ ₁₀ inch) in diameter. Cf. rudite n., arenaceous adj. a.

ΘΚΠ

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

saccharine1833

saccharoid1833

saccharoidal1838

heteroblastic1888

rudaceous1903

homoeoblastic1920

1903 A. W. Grabau in Bull. Geol. Soc. Amer. 14 352 Under the clastic limestones we have..C. Calcirudite, comprising coarsely fragmental or ‘rudaceous’ rocks.

1949 F. J. Pettijohn Sedimentary Rocks vii. 196 The rudaceous subtypes..are marked by characteristic compositional and textural features.

2000 R. C. Selley Appl. Sedimentol. (ed. 2) viii. 380 Traditionally the rudaceous deposits are divided into breccias, whose particles are angular, and conglomerates, whose particles are rounded.

This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022).

单词	rudaceous
释义	rudaceousadj. Brit. /rᵿˈdeɪʃəs/, U.S. /ruˈdeɪʃəs/ Origin: A borrowing from Latin, combined with an English element. Etymons: Latin rūdus , -aceous suffix. Etymology: < classical Latin rūdus rubble (see rudera n.) + -aceous suffix. Geology. Of a clastic sedimentary rock: composed of grains coarser than sand, i.e. greater than 2 mm (approx. ¹/ ₁₀ inch) in diameter. Cf. rudite n., arenaceous adj. a. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > texture or colour > [adjective] > texture > granular saccharine1833 saccharoid1833 saccharoidal1838 heteroblastic1888 rudaceous1903 homoeoblastic1920 1903 A. W. Grabau in Bull. Geol. Soc. Amer. 14 352 Under the clastic limestones we have..C. Calcirudite, comprising coarsely fragmental or ‘rudaceous’ rocks. 1949 F. J. Pettijohn Sedimentary Rocks vii. 196 The rudaceous subtypes..are marked by characteristic compositional and textural features. 2000 R. C. Selley Appl. Sedimentol. (ed. 2) viii. 380 Traditionally the rudaceous deposits are divided into breccias, whose particles are angular, and conglomerates, whose particles are rounded. This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022). < adj.1903
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