subhedraladj.

Brit.

/ˌsʌbˈhiːdr(ə)l/,

/ˌsʌbˈhɛdr(ə)l/, U.S.

/ˌsəbˈhidrəl/

Origin: Formed within English, by derivation. Etymons: sub- prefix, -hedral comb. form.

Etymology: < sub- prefix + -hedral comb. form.

Crystallography and Geology.

Of a crystal: having an imperfect but recognizable shape, with partially developed or uneven faces; (of a substance) consisting of such crystals; = hypidiomorphic adj. Cf. anhedral adj., euhedral adj.

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > crystal irregularities > [adjective] > partially developed

subhedral1906

1906 W. Cross et al. in Jrnl. Geol. (Chicago) 14 698 Shapes of crystals may be described in general terms with reference to the presence or absence of crystallographic faces as:..Subhedral, partly bounded by crystal faces, hypautomorphic, hypidiomorphic.

1950 Amer. Mineralogist 35 1017 In the stratum..subhedral crystals of searlesite up to 7 inches long, 4 inches wide, and one inch thick are not uncommon.

1990 Jrnl. Petrol. 31 819 Olivine is generally subhedral to anhedral and commonly has thick rims of iddingsite.

2004 W. D. Nesse Introd. Optical Mineral. (ed. 3) xiv. 259/1 Zircon commonly occurs as euhedral to subhedral tetragonal crystals with pyramidal terminations.

This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022).

单词	subhedral
释义	subhedraladj. Brit. /ˌsʌbˈhiːdr(ə)l/, /ˌsʌbˈhɛdr(ə)l/, U.S. /ˌsəbˈhidrəl/ Origin: Formed within English, by derivation. Etymons: sub- prefix, -hedral comb. form. Etymology: < sub- prefix + -hedral comb. form. Crystallography and Geology. Of a crystal: having an imperfect but recognizable shape, with partially developed or uneven faces; (of a substance) consisting of such crystals; = hypidiomorphic adj. Cf. anhedral adj., euhedral adj. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > crystal irregularities > [adjective] > partially developed subhedral1906 1906 W. Cross et al. in Jrnl. Geol. (Chicago) 14 698 Shapes of crystals may be described in general terms with reference to the presence or absence of crystallographic faces as:..Subhedral, partly bounded by crystal faces, hypautomorphic, hypidiomorphic. 1950 Amer. Mineralogist 35 1017 In the stratum..subhedral crystals of searlesite up to 7 inches long, 4 inches wide, and one inch thick are not uncommon. 1990 Jrnl. Petrol. 31 819 Olivine is generally subhedral to anhedral and commonly has thick rims of iddingsite. 2004 W. D. Nesse Introd. Optical Mineral. (ed. 3) xiv. 259/1 Zircon commonly occurs as euhedral to subhedral tetragonal crystals with pyramidal terminations. This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022). < adj.1906
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