tetraóxido

== Portuguese == === Etymology === From tetra- +‎ óxido. === Pronunciation === === Noun === tetraóxido m (plural tetraóxidos) (inorganic chemistry) tetroxide == Spanish == === Etymology === From tetra- +‎ óxido, first element from Ancient Greek τέτταρες (téttares). === Noun === tetraóxido m (plural tetraóxidos) tetroxide