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| English | Arabic |
| secondary biotope In the case of disruption of an existing biotope, secondary biotope can be created as a compensation and substitute measure for the loss of the natural one | موطن حيوي ثانوي |
| secondary education The years of instruction following elementary school and until the end of high school | التعليم الثانوي |
| secondary sector The part of a country or region's economy that produces commodities without much direct use of natural resources | قطاع ثانوي |
| secondary sludge | حمأ ثانوي |
| secondary treatment Stage of the process of waste water treatment: following primary treatment by sedimentation, the second step in most wastewater systems in which biological organisms decompose most of the organic matter into a innocuous, stable form | معالجة ثانوية |
| secondary waste treatment | معالجة ثانوية للمخلفات |
| secondary water treatment | معالجة ثانوية, مياه الصرف |