trùng phương

== Vietnamese == === Etymology === Perhaps Sino-Vietnamese word from 重 and 方, as in a blend of trùng lặp (“to compound”) +‎ bình phương (“square”), as in "compounding a square raises the power to 4". === Pronunciation === (Hà Nội) IPA(key): [t͡ɕʊwŋ͡m˨˩ fɨəŋ˧˧] (Huế) IPA(key): [ʈʊwŋ͡m˦˩ fɨəŋ˧˧] (Saigon) IPA(key): [ʈʊwŋ͡m˨˩ fɨəŋ˧˧] === Adjective === trùng phương (algebra, of a phương trình (“equation”)) biquadratic (with only the 4th and 2nd powers)