Biological process

down regulation of thymocyte apoptosis, down-regulation of thymocyte apoptosis, downregulation of thymocyte apoptosis

Any process that stops, prevents, or reduces the frequency, rate or extent of thymocyte death by apoptotic process.

negative regulation of immature T cell apoptosis

Note that a thymocyte is an immature T cell located in the thymus (CL:0000893).