Etymology
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detritus (n.)

in geology, 1795, "process of erosion" (a sense now obsolete), from Latin detritus "a wearing away," from detri-, stem of detere "wear away," from de "away" (see de-) + terere "to rub, wear" (from PIE root *tere- (1) "to rub, turn"). Sense of "loose fragments of rock produced by erosion" is 1802, probably from French detritus; incorrect, in any case. Figurative or transferred sense of "waste material, debris" is by 1834. Related: Detrital; detrited; detrition.

updated on August 07, 2018

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Definitions of detritus from WordNet

detritus (n.)
the remains of something that has been destroyed or broken up;
Synonyms: debris / dust / junk / rubble
detritus (n.)
loose material (stone fragments and silt etc) that is worn away from rocks;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.