IPA: /ˌɛkˈskrɛmənˌtəl/
KK: /ɛkˈskrɛmənˌtəl/
Relating to waste matter that is expelled from the body, especially solid waste.
The excremental waste was carefully disposed of to maintain hygiene.
Excremental → It is formed from "excrement" (from Latin "excrementum", meaning something that is separated or cast out) and the suffix "-al" (meaning pertaining to). The word "excremental" refers to something that pertains to or is related to excrement.
Think of something that is 'pertaining to' ('-al') what is 'cast out' ('excrementum') — that's why excremental relates to waste.