caddis
UK[ˈkædɪs]US[ˈkædɪs]
n
The larva of a caddisfly, which lives in water and constructs a protective case from sticks, sand, or other debris.
Etymology
The origin of 'caddis' is obscure, with its first recorded use in English dating to the mid-17th century. It is likely an alteration of the obsolete word 'cadace,' which referred to a worsted wool ribbon or binding, itself derived from Middle French 'cadas' or 'cadaz,' meaning a kind of cotton or woolen tape. The semantic leap from a type of ribbon to the aquatic larva is thought to be due to the resemblance of the silken case spun by the larva to a piece of coarse ribbon or yarn. Thus, the word's journey reflects a metaphorical extension based on visual similarity, anchoring an obscure biological term in a more familiar material object.
Analysis
The word 'caddis' is a simplex word of uncertain origin, likely a loanword. It functions as a single, unanalyzable lexical unit in modern English.
Examples
The trout was feeding eagerly on the caddis larvae dislodged from the riverbed.
He carefully examined the tiny pebbles and twigs that formed the caddis's portable home.
Fly fishermen often imitate the caddis in its pupal stage during a hatch.