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excretion
This term carries a clinical and biological tone, stripping away the social taboos or visceral disgust often associated with bodily waste. It focuses on the physiological necessity of maintaining internal balance rather than the act of elimination itself. In medical and scientific discourse, it is used to describe any substance leaving the body, including sweat and carbon dioxide, whereas common language might use more specific or colloquial terms for different types of waste.
Uncountable when referring to the biological process of removing toxins. Countable when referring to a specific sample of waste material collected for a medical test.