What does buckthorn mean?
Buckthorn is the common name for a group of thorny shrubs and small trees, chiefly of the genus Rhamnus in the buckthorn family (Rhamnaceae). These hardy plants produce small greenish flowers and berry-like fruits that ripen to black or red, and they have long been valued for practical purposes: the bark of some species yields the laxative drug cascara, while the berries were historically the source of sap green, a pigment prized by painters. Several buckthorns are well known by name, including alder buckthorn and the coastal sea buckthorn, whose vivid orange berries are now harvested for juices and oils. In North America, however, common and glossy buckthorn have become notorious as aggressive invaders of woodlands and wetlands, making the word familiar in conservation writing. The term appears mainly in botany, gardening, and ecological contexts, and it typically takes a qualifying word to identify the exact species being discussed.
nounA thorny shrub or small tree of the genus Rhamnus, bearing small flowers and berry-like fruits, some species of which yield medicinal purgatives and dyes.
- Any thorny shrub or small tree of the genus Rhamnus (family Rhamnaceae), some species yielding purgative drugs such as cascara and dyes such as sap green.
- Any of several similar thorny plants outside the genus Rhamnus, notably sea buckthorn (Hippophae rhamnoides).
"The hedgerow was thick with buckthorn, its dark berries drawing flocks of fieldfares in late autumn."
"Conservationists spent the weekend pulling invasive buckthorn seedlings out of the woodland understory."
"Sea buckthorn oil, pressed from its bright orange berries, has become popular in skincare products."
The plural is regular and is used mainly when referring collectively to different species or individual specimens.
"Both native and introduced buckthorns line the river valley here."
One of the most famous dyes in history — 'sap green', beloved of medieval manuscript painters — came straight from the berries of the buckthorn.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of buckthorn
The word buckthorn dates from around the sixteenth century in English, formed transparently from 'buck' (a male goat) plus 'thorn', likely because goats browse readily on the plant or by association with other 'thorn' shrub names. It follows a long English tradition of compound shrub names built on 'thorn', alongside hawthorn and blackthorn. The genus name Rhamnus was known to classical Greek and Roman writers, who recorded the plant's medicinal use.
How buckthorn is actually used
Primarily used in botanical, gardening, and conservation contexts rather than everyday conversation. In North America, common buckthorn and glossy buckthorn are frequently discussed as invasive species. The name covers several distinct plants, so writers usually specify which kind — e.g. alder buckthorn, sea buckthorn — when precision matters.
Easily confused with buckthorn
Blackthorn (Prunus spinosa) is a plum-bearing hedge plant of the rose family, whereas buckthorn belongs to the unrelated genus Rhamnus.
Boxthorn is a member of the nightshade family (Lycium, including goji), while buckthorn is the thorny shrub of the genus Rhamnus.