## Dandelion
The dandelion takes its name not from a lion's mane or golden colour, but from its teeth. The word enters English in the fifteenth century as a borrowing of Old French *dent de lion*, literally 'tooth of the lion' — a reference to the deeply serrated, jagged-edged leaves that early herbalists thought resembled a row of lion's fangs. The plant's botanical genus *Taraxacum* tells a different story altogether, but the vernacular name stuck, and the lion's tooth has been with English ever since.
## The Name's Journey
The earliest attested English form appears in the *Agnus Castus* herbal of around 1425, where it is recorded as *dent de lion* in recognisably French spelling. By the late fifteenth century, anglicised spellings such as *dandelyon* appear in medical and botanical texts. The form *dandelion* stabilises through the sixteenth century as English orthography hardens around it.
Old French *dent de lion* is itself a calque — a loan translation — of Medieval Latin *dens leonis*, the name given by physicians and herbalists writing in the learned tradition. The Latin form appears in twelfth- and thirteenth-century herbals, including works associated with the School of Salerno, the influential southern Italian centre of medieval medicine. It is through this medical Latin that the name spread across Europe: *dens leonis* in Latin becoming *dent de lion* in French, *Löwenzahn* in German, *diente de león* in Spanish, and *dandelion* in English, all by translation rather than borrowing.
## Root Analysis
The Latin *dens* (genitive *dentis*, 'tooth') descends from Proto-Indo-European **\*h₁dent-*, the reconstructed root meaning 'tooth'. This root is extraordinarily well-preserved across the Indo-European family. Greek has *odous* (genitive *odontos*), giving English *orthodontics* and *mastodon*. Sanskrit has *dant-*. Old English had *tōþ*, which survives as *tooth* — itself a cognate, though the forms have drifted far apart.
The Latin branch of **\*h₁dent-* gives English a cluster of learned borrowings: *dental*, *dentist*, *dentition*, *indent* (originally to cut teeth-like notches into a document — a deed cut with a jagged edge so the two halves could be matched), and *dandelion* itself, the most disguised member of the family. *Trident* carries the root too: Latin *tridens* means 'three-toothed', from *tri-* (three) and *dens*.
## Folk Names and the Plant's Reputation
### French: Pissenlit
French retains *pissenlit* alongside the more formal *dent de lion*, and *pissenlit* is far more candid about the plant's properties. It means 'piss-the-bed', a direct reference to the dandelion's well-documented diuretic effect. The plant was used medicinally across medieval and early modern Europe as a treatment for liver and kidney complaints, and its diuretic action was known to every herbalist and most children. English has its own folk equivalent, 'piss-a-bed', recorded from at least the sixteenth century, though it has largely retreated from common use while the French term remains current.
### German: Löwenzahn
German *Löwenzahn* — 'lion's tooth' — is a straightforward calque of the Latin *dens leonis*, following the same translation path as the English name. It demonstrates how thoroughly Medieval Latin herbalism standardised plant names across Europe: from Spain to Germany, educated speakers reached for the same image.
### Irish and Gaelic
Irish *caisearbhán* (sometimes *caisiarbhán*) takes a different path entirely. The name derives from *cais*, related to bitterness, and *bán*, white — a reference to the plant's milky sap and bitter taste rather than any lion imagery. Scottish Gaelic has *beàrnan Brìde*, 'notched plant of Bridget', linking the plant to St Brigid's feast in early February, when the first dandelions of the year were traditionally observed.
## Cultural and Medicinal Context
The dandelion's many names reflect the plant's prominence in pre-modern medicine and daily life. It was among the most used plants in European folk medicine: the leaves eaten as a spring tonic and diuretic, the roots roasted as a coffee substitute, the flowers fermented into wine. Because it was so widely used, it accumulated names in every language — each name recording a different observation about its properties, appearance, or seasonal behaviour.
The lion's-tooth naming, however, won out in the formal botanical tradition because it was tied to the prestige of Latin herbalism. The Medical Latin name *dens leonis* gave the plant a learned identity that survived the transition from manuscript to printed herbal, and from there into the vernacular languages of Europe.
## Cognates and Relatives
Dandelion's cognates through **\*h₁dent-* include *dental*, *dentist*, *dentin*, *dentifrice*, *indent*, *indenture*, *trident*, *toothsome*, and *tooth* itself. The word *dandelion* is therefore a cousin of the word *tooth* — the same ancient root, one path through Latin and French, one through Germanic, arriving at two words that look nothing alike but name the same part of the body.