o-grade
(mineralogy) A monoclinic-prismatic mineral containing iron, oxygen, tungsten, and zinc.
simple past tense and past participle of correspond
Jacana spinosa, a wader in the family Jacanidae.
(Indo-European linguistics) In Proto-Indo-European linguistics, an ablaut form of a Proto-Indo-European root, characterised by the presence of the */o/ vowel phoneme in place of */e/.
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