The last part of the word was probably assimilated to piller

The last part of the word was probably assimilated to piller

The last part of the word was probably assimilated to piller

Caterpillar. "Catyrpelwyrm among fruit" is corrupted from old French Chatte peleuse (Palsgrave, 1530). "Hairy cat;" the last part of the word was probably assimilated to piller, a robber or despoiler (Palmer's Folk Etymology).

Caterwauling. The wrawl of cats in rutting times; any hideous noise. Topsel gives catwralling, to "wrall;" "wrawl," to rail or quarrel with a loud voice; hence the Yorkshire expression, "raising a wrow," meaning a row or quarrel. There is also the archaic adjective wraw (angry). Caterwaul, therefore, is the wawl or wrawl of cats; the er being either a plural, similar to "childer" (children), or a corrupted genitive. Brewer's Dictionary of Phrase and Fable.

"What a caterwawling do you keep here!"