tholoidn.

/ˈθəʊlɔɪd/

Etymology: < Greek θόλος see tholos n. + -oid suffix.

Geology.

A dome-shaped, steep-sided extrusion of hardened lava plugging the vent of a volcano. In quot. 1912 representing a German form.

ΘΚΠ

the world > the earth > structure of the earth > structural features > volcanic formations > [noun] > lava formations > plug

neck1876

plug1882

spine1903

tholoid1912

1912 Jrnl. Geol. (Chicago) 20 85 ‘Tholoides’ have slopes of over 35° and are convex upward.

1939 Nature 25 Nov. 913/2 Of the latter [sc. new volcanoes] there were two:..(b) Iōzima-Sintō, south of Kyūsyū.., which was of the tholoid type.

1976 P. Francis Volcanoes iv. 151 Even when the tholoid is shrouded in mist and invisible, as it often is in the afternoon, the dry clattering continues, with every now and then a much larger collapse taking place.

This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).

单词	tholoid
释义	tholoidn. /ˈθəʊlɔɪd/ Etymology: < Greek θόλος see tholos n. + -oid suffix. Geology. A dome-shaped, steep-sided extrusion of hardened lava plugging the vent of a volcano. In quot. 1912 representing a German form. ΘΚΠ the world > the earth > structure of the earth > structural features > volcanic formations > [noun] > lava formations > plug neck1876 plug1882 spine1903 tholoid1912 1912 Jrnl. Geol. (Chicago) 20 85 ‘Tholoides’ have slopes of over 35° and are convex upward. 1939 Nature 25 Nov. 913/2 Of the latter [sc. new volcanoes] there were two:..(b) Iōzima-Sintō, south of Kyūsyū.., which was of the tholoid type. 1976 P. Francis Volcanoes iv. 151 Even when the tholoid is shrouded in mist and invisible, as it often is in the afternoon, the dry clattering continues, with every now and then a much larger collapse taking place. This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018). < n.1912
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