Senna1. (n.) The leaves of several leguminous plants of the genus Cassia. (C. acutifolia, C. angustifolia, etc.). They constitute a valuable but nauseous cathartic medicine.
2. (n.) The plants themselves, native to the East, but now cultivated largely in the south of Europe and in the West Indies.
Thesaurus Entries
acacia, ailanthus, alder, alligator pear, allspice, almond, apple, apricot, ash, aspen, atramentous, avocado, balsa, balsam, banyan, bass, basswood, bay, bayberry, beamless, beech, beechwood, betel palm, birch, black, black as coal, black as ebony, black as ink, black as midnight, black as night, black race, blackness, buckeye, burl, butternut, buttonwood, cacao, caliginous, candleberry, cashew, cassia, catalpa, charcoal, cherry, chestnut, chinquapin, cinnamon, citron, clove, coal, coal-black, coaly, coconut, cork, cork oak, crow, cypress, dark, dark as night, dark as pitch, darkling, darkness, darksome, deep black, dogwood, ebon, eclipsed, elder, elm, eucalyptus, fig, fir, frankincense, grapefruit, guava, gum, gumwood, hawthorn, hazel, hemlock, henna, hickory, holly, hop tree, horse chestnut, ink, ink-black, inkiness, inky, ironwood, jet, jetty, juniper, kumquat, laburnum, lancewood, larch, laurel, lemon, lime, linden, litchi, litchi nut, locust, logwood, magnolia, mahogany, mango, mangrove, maple, medlar, melanism, midnight, mountain ash, mulberry, night, night-black, night-clad, night-cloaked, night-dark, night-enshrouded, night-filled, night-mantled, night-veiled, nigrescence, nigritude, nigrous, nutmeg, oak, obfuscated, obscure, obscured, occulted, olive, orange, palm, papaw, papaya, peach, pear, pecan, persimmon, pine, pistachio, pitch, pitch-black, pitch-dark, pitchy, plane, plum, pomegranate, poplar, quince, raffia palm, rain tree, raven, raven-black, rayless, redwood, sable, sandalwood, sassafras, senna, sequoia, sloe, sloe-black, sloe-colored, smoke, smut, soot, spruce, starless, sumac, sunless, sycamore, tangerine, tar, tar-black, tarry, teak, tenebrious, tenebrose, tenebrous, tulip tree, unilluminated, unlighted, unlit, walnut, willow, witch hazel, yew