Caterpillar
The word *caterpillar* descends from Old North French *catepelose* — literally 'hairy cat' — and arrived in English during the fifteenth century carrying a vivid visual metaphor that has survived largely intact for six hundred years, even as the creature's name underwent significant phonetic transformation on its way to the modern form.
Old French Origins
The earliest traceable form is Old North French *catepelose*, a compound of *cate* (cat) and *pelose* (hairy), the latter from Latin *pilosus* (covered in hair), itself from *pilus* (hair). The form appears in Anglo-Norman texts of the thirteenth and fourteenth centuries. A parallel Old French form, *chatepelose*, shows the standard French *chat* for cat rather than the northern dialectal *cate*. The word was descriptive and immediate: a caterpillar, with its dense bristles, resembled a small, fuzzy feline.
Entry into English
The first attested English spellings cluster around 1440–1450. The *Promptorium Parvulorum* (c. 1440), one of the earliest English-Latin dictionaries, records *catyrpel*. Other fifteenth-century forms include *catyrpeller*, *caterpeler*, and *catirpel*. These variants reveal a word still settling into the language, its French phonology being worn smooth by English speech habits.
The second element underwent the most dramatic shift. French *pelose* (hairy) was not a familiar word in English, and speakers reanalysed it — a process linguists call folk etymology — reshaping the unfamiliar syllable toward something recognisable. The result was *-piller*, pulled into alignment with the English verb *to pill* or *to peel*, meaning to strip or plunder. By the late fifteenth century, *caterpillar* was being used metaphorically for a human extortioner — one who strips others bare — and this sense may have reinforced the *piller* (pillager, plunderer) reanalysis. Shakespeare uses it in this pejorative human sense in *Richard II* (1595): *'The caterpillars of the commonwealth, / Which I have sworn to weed and pluck away.'*
Root Analysis
The Latin *pilosus* derives from *pilus* (hair), which connects to the Proto-Indo-European root *\*pilo-*, relating to hair or fibre. Latin *pilus* gives English *pile* (as in carpet pile), *depilatory*, and *pilose*. The cat element traces through Old French *cate*/*chat* from Latin *cattus*, a Late Latin word of uncertain — possibly North African — origin that displaced classical *feles* in popular speech across the Roman Empire.
There is no unified PIE reconstruction for the compound itself; it is a medieval vernacular formation assembled from available metaphorical materials.
Semantic Shift and Cultural Context
The *hairy cat* metaphor reflects a mode of naming common across European languages, where insects and larvae were described through animal resemblance. The caterpillar's bristled, elongated body invited comparison to cats, worms, bears, and dogs depending on the language: French *chenille* (from Latin *canicula*, little dog), German *Raupe*, and Spanish *oruga* (from Latin *eruca*) each encode different visual frameworks.
The pejorative human sense — caterpillar as a grasping, devouring person — was active in English from the late 1400s through the seventeenth century, exploiting the creature's reputation for destroying crops and stripping vegetation. This metaphorical range has since narrowed entirely back to the zoological referent.
Cognates and Relatives
- French *chenille*: from Latin *canicula* (little dog), a parallel animal-metaphor. Also gives English *chenille* fabric, named for its furry, caterpillar-like texture. - Latin *eruca*: classical term for caterpillar; survives in botanical *Eruca* (rocket/arugula) and the engineering term *eruciform* (caterpillar-shaped). - English *pile* (soft surface): shares the Latin *pilus* root with the *pelose* component. - English *depilatory*: from Latin *depilare* (to remove hair), same *pilus* lineage.
Modern Usage
Contemporary English uses *caterpillar* exclusively for larval Lepidoptera. The word carries no metaphorical freight in standard modern usage, though it survives as a brand name (Caterpillar Inc., heavy machinery) — a twentieth-century adoption of the word's connotations of slow, powerful, ground-level movement.
The phonetic distance between *catepelose* and *caterpillar* is a textbook case of folk etymology: a foreign word, imperfectly heard and imperfectly remembered, reshaped toward native morphemes. The hairy cat is still present at the beginning. The plunderer crept in at the end.