| Blackthorn 1. (n.) A spreading thorny shrub or small tree (Prunus spinosa), with blackish bark, and bearing little black plums, which are called sloes; the sloe. 2. (n.) A species of Crataegus or hawthorn (C. tomentosa). Both are used for hedges. Thesaurus Entries Persian berry, alder, azalea, bayberry, blackberry, blackthorn, box, bramble, brier, brier bush, broom, bush, caper, cinchona, coca, coffee, cranberry, currant, daphne, elder, forsythia, frangipani, fuchsia, furze, gardenia, gooseberry, gorse, greasewood, guava, haw, heather, hemp tree, henna, hibiscus, holly, huckleberry, hydrangea, indigo, juniper, jute, laurel, leatherleaf, lilac, magnolia, manzanita, mock orange, mountain lilac, myrtle, ninebark, oleander, photinia, poison sumac, privet, pussy willow, rhododendron, rose of Sharon, rosebay, rosemary, sage, sagebrush, sand myrtle, scrub, shrubbery, sisal, snow wreath, snowberry, spiraea, sumac, symplocos, syringa, tamarisk, veronica, witch hazel, yellowroot |