Caterpillar — From Old French to English | etymologist.ai
caterpillar
/ˈkætərˌpɪlər/·noun·c. 1440, attested as 'catyrpel' in the Promptorium Parvulorum·Established
Origin
From Old North French catepelose meaning 'hairy cat' (Latin pilosus, hairy), the word entered English around 1440 and was reshaped by folk etymology — its unfamiliar suffix reanalysed as piller (plunderer), producing a creature-name that doubled for centuries as a term for human extortioners.
Definition
The larval stage of a butterfly or moth, typically a soft-bodied, segmented creature with multiple pairs of legs that feeds on plant matter before undergoing metamorphosis.
The Full Story
Old Frenchc. 1400–1450well-attested
TheEnglishword 'caterpillar' first appears around 1440 in the 'Promptorium Parvulorum', recorded as 'catyrpel'. The word derives from Old Northern French 'catepelose' or Old French 'chatepelose', meaning literally 'hairy cat' — from 'chate' (she-cat, from Latin 'catta') plus 'pelose' (hairy, from Latin 'pilosus', from 'pilus', hair). The semantic logic is descriptive: the fuzzy, bristled appearance of many caterpillars struck medieval French speakers as cat-like in texture. The Latin
Did you know?
For over two centuries after entering English, 'caterpillar' was a working insult for human beings — specifically corrupt courtiers and tax extortioners who stripped the poor bare. Shakespeare used it this way in Richard II (1595), and the metaphor was common enough that readersneeded no gloss. The creature's name had been folk-etymologised into 'cat-pillager' in the popular imagination, and English speakersleaned
*pilo- meaning 'hair'. English reshaped the borrowed form under folk-etymology: the first syllable became 'cater-' while '-pillar' may reflect association with Middle English 'piller' (a
as a 'cat-plunderer' or 'ravaging cat'. This folk-etymological reanalysis was complete by the late 15th century. Shakespeare used 'caterpillar' as a human insult in Richard II (1595): 'The caterpillars of the commonwealth, / Which I have sworn to weed and pluck away.' The pejorative human sense — corrupt extortioner — was active for over two centuries before the word settled back to its purely zoological meaning. Key roots: *pilo- (Proto-Indo-European: "hair, fleece, single strand of hair"), pilosus (Latin: "hairy, covered with hair (from pilus, a hair)"), catta (Late Latin: "cat (domestic feline); of uncertain, possibly Afro-Asiatic origin").