tephran.

Brit.

/ˈtɛfrə/, U.S.

/ˈtɛfrə/

Etymology: < Swedish tefra (S. Thórarinsson 1944, in Geografiska Annaler XXVI. 114), < Greek τέϕρα ash.

Geology.

Dust and rock fragments that have been ejected into the air by a volcanic eruption. Frequently attributive.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > ejected volcanic material > [noun] > stones, dust, or sand

sand flood1668

lapilli1747

rapilli1768

lapillo1811

tephra1944

1944 Geografiska Annaler XXVI. 210 The author suggests (volcanic) ash or (better) tephra as a collective term for all clastic ejectamenta.

1970 Nature 25 July 335/1 The maximum thickness of the tephra layer was 7 cm at 15 km from the volcano.

1972 National Geographic CXLI. 718/2 Commercial interests are removing this layer—known as tephra—since it makes a highly cohesive and waterproof mortar, serves as an insulating material, and constitutes an important component of cement.

1973 Nature 9 Feb. 372/2 Because of its close vicinity to the eruption the town was threatened by tephra fall.

1979 Sci. Amer. Dec. 134/2 The cloud of tephra and gas rises high above the volcano, and particles in it are carried downwind, producing a rain of tephra that forms a deposit called a tephra mantle.

This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2022).

单词	tephra
释义	tephran. Brit. /ˈtɛfrə/, U.S. /ˈtɛfrə/ Etymology: < Swedish tefra (S. Thórarinsson 1944, in Geografiska Annaler XXVI. 114), < Greek τέϕρα ash. Geology. Dust and rock fragments that have been ejected into the air by a volcanic eruption. Frequently attributive. ΘΚΠ the world > the earth > structure of the earth > constituent materials > ejected volcanic material > [noun] > stones, dust, or sand sand flood1668 lapilli1747 rapilli1768 lapillo1811 tephra1944 1944 Geografiska Annaler XXVI. 210 The author suggests (volcanic) ash or (better) tephra as a collective term for all clastic ejectamenta. 1970 Nature 25 July 335/1 The maximum thickness of the tephra layer was 7 cm at 15 km from the volcano. 1972 National Geographic CXLI. 718/2 Commercial interests are removing this layer—known as tephra—since it makes a highly cohesive and waterproof mortar, serves as an insulating material, and constitutes an important component of cement. 1973 Nature 9 Feb. 372/2 Because of its close vicinity to the eruption the town was threatened by tephra fall. 1979 Sci. Amer. Dec. 134/2 The cloud of tephra and gas rises high above the volcano, and particles in it are carried downwind, producing a rain of tephra that forms a deposit called a tephra mantle. This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2022). < n.1944
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