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Answer for the clue "An oxide containing five atoms of oxygen in the molecule ", 9 letters:
pentoxide

Word definitions for pentoxide in dictionaries

Wikipedia Word definitions in Wikipedia
pentoxide may refer to: Antimony pentoxide , SbO Arsenic pentoxide , AsO Carbon pentoxide , CO Dinitrogen pentoxide , NO Iodine pentoxide , IO Niobium pentoxide , NbO Phosphorus pentoxide , PO Tantalum pentoxide , TaO Tungsten pentoxide , WO

WordNet Word definitions in WordNet
n. an oxide containing five atoms of oxygen in the molecule

Wiktionary Word definitions in Wiktionary
n. (context chemistry English) any oxide containing five oxygen atoms in each molecule

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Pentoxide \Pen*tox"ide\, n. [Penta- + oxide.] (Chem.) An oxide containing five atoms of oxygen in each molecule; as, phosphorus pentoxide, P2O5 .

Usage examples of pentoxide.

When the sulphuric oxide has been satisfied, the chlorine is distributed, taking the bases in the same order, then the nitric pentoxide, and lastly the carbon dioxide.

Thick, oily brooklets of thick nitric acid boiled and fumed brown as they crept down to the sea, bearing their load of undissolved, solid nitric pentoxide.

Penton bent over his pile of magnesium metal, and a moment later a terrific flare of blue-white light glared through the enveloping pall of phosphorus pentoxide smoke.