tephra
noun
teph·ra ˈte-frə 
: solid material ejected into the air during a volcanic eruption
especially : ash entry 2 sense 2b
Example Sentences
Recent Examples on the Web However, the tephra used in the tomb's mortar contained much more potassium-rich leucite. 
Jennifer Ouellette, Ars Technica, 17 Feb. 2022 However, the tephra used in the tomb's mortar contained much more potassium-rich leucite. Jennifer Ouellette, Ars Technica, 17 Feb. 2022 The ice cores' tephra, which has a unique geochemical fingerprint, can be used to link the volcanic eruption to an exact volcanic source. David Bressan, Forbes, 3 May 2022 However, the tephra used in the tomb's mortar contained much more potassium-rich leucite. Jennifer Ouellette, Ars Technica, 17 Feb. 2022 As every layer of ice represents one year, layers showing traces of volcanic tephra can be precisely dated. David Bressan, Forbes, 3 May 2022 However, the tephra used in the tomb's mortar contained much more potassium-rich leucite. Jennifer Ouellette, Ars Technica, 17 Feb. 2022 The scientists discovered that the tomb's mortar was similar to that used in the walls of the Markets of Trajan: volcanic tephra from the pozzolane rosse pyroclastic flow, binding together large chunks of brick and lava aggregate. Jennifer Ouellette, Ars Technica, 17 Feb. 2022 However, the tephra used in the tomb's mortar contained much more potassium-rich leucite. Jennifer Ouellette, Ars Technica, 17 Feb. 2022 See More
Jennifer Ouellette, Ars Technica, 17 Feb. 2022 However, the tephra used in the tomb's mortar contained much more potassium-rich leucite. Jennifer Ouellette, Ars Technica, 17 Feb. 2022 The ice cores' tephra, which has a unique geochemical fingerprint, can be used to link the volcanic eruption to an exact volcanic source. David Bressan, Forbes, 3 May 2022 However, the tephra used in the tomb's mortar contained much more potassium-rich leucite. Jennifer Ouellette, Ars Technica, 17 Feb. 2022 As every layer of ice represents one year, layers showing traces of volcanic tephra can be precisely dated. David Bressan, Forbes, 3 May 2022 However, the tephra used in the tomb's mortar contained much more potassium-rich leucite. Jennifer Ouellette, Ars Technica, 17 Feb. 2022 The scientists discovered that the tomb's mortar was similar to that used in the walls of the Markets of Trajan: volcanic tephra from the pozzolane rosse pyroclastic flow, binding together large chunks of brick and lava aggregate. Jennifer Ouellette, Ars Technica, 17 Feb. 2022 However, the tephra used in the tomb's mortar contained much more potassium-rich leucite. Jennifer Ouellette, Ars Technica, 17 Feb. 2022 See More Word History
Etymology
New Latin, from Greek, ashes; akin to Sanskrit dahati it burns — more at foment
First Known Use
circa 1944, in the meaning defined above