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[From thorium.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Elements & Compounds) another name for thorium dioxide
[C19: thorium + -a, on the model of magnesia]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈθɔr i ə, ˈθoʊr-)

thorium dioxide, a white, heavy, water-insoluble powder, ThO2, used chiefly in incandescent mantles.
[1835–45; thori (um) + -a4]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in classic literature ?
"Thoria lies at the outer verge of the Land of Awful Shadow.
He had found none to his liking among the Sari, nor farther on until he had come to the land of the Thoria, and there he had found and fought for this very lovely Thorian maiden whom he was bringing back to his own people.
In addition to this, the Israeli Military Prosecution announced the closure of the file of the investigation into the murder of Abu Thoria, who took part in the events of the return marches on the Gaza Strip border without taking any judicial action against any of the soldiers and officers, saying that there is no evidence that Abu Thuraya was killed by direct fire from the Israeli army while on his wheelchair raising the Palestinian flag.
Keralie is the best thief in Thoria, the mercantile region of Quadara.
SATURDAY'S SOLUTION: arty; author; AUTHORITY; auto; hart; hotty; hurt; hutia; iota; oath; oaty; ratio; ratty; riot; rota; roti; rout; ruth; rutty; ryot; tahr; taro; tarot; tart; tarty; taut; that; thirty; thoria; thou; throat; throaty; thuya; tort; tour; tout; trait; tray; trio; trot; troth; trout; troy; truth; tryout; tutor; tyro; youth; yurt.
Presente a l'inauguration de l'evenement, sa fille benjamine, Benazzouz Thoria, dit tout le bien de son defunt pere.Elle a souligne que [beaucoup moins que] cette exposition a pour merite d'exhumer ses travaux meconnus du grand public [beaucoup plus grand que].
For her part, the chairwoman of the UNDP rule of law, and human rights Thoria Bozorro kova , explained that the NHRC is an independent institution that work for the ideal protection of human rights, noting that the UNDP is aware of the importance of cooperation between the two sides and the work for realizing the rights of women, children, and the disabled and to intensify efforts to create a strong culture of respect for human rights, hoping for the work together in order to produce a document of human rights to be included in the Sudan's constitution.
They will be supported by Thoria, The Broken Rebels and Charles Dexter Ward and the Imagineer.
It has been widely used for coatings on atomicfuel particles (thoria and urania) for nuclear-fusion power plants due to its low neutron cross section.