What is "green vitriol"

Vitriol \Vit"ri*ol\, n. [F. vitriol; cf. Pr. vitriol, vetriol, Sp. & Pg. vitriolo, It. vitriuolo; fr. L. vitreolus of glass, vitreus vitreous. See Vitreous.] (Chem.)

1. A sulphate of any one of certain metals, as copper, iron, zinc, cobalt. So called on account of the glassy appearance or luster.

2. Sulphuric acid; -- called also oil of vitriol. So called because first made by the distillation of green vitriol. See Sulphuric acid, under Sulphuric.

   Blue vitriol. See under Blue.

   Green vitriol, ferrous sulphate; copperas. See under Green.

   Oil of vitriol, sulphuric or vitriolic acid; -- popularly so called because it has the consistency of oil.

   Red vitriol, a native sulphate of cobalt.

   Vitriol of Mars, ferric sulphate, a white crystalline substance which dissolves in water, forming a red solution.

   White vitriol, zinc sulphate, a white crystalline substance used in medicine and in dyeing. It is usually obtained by dissolving zinc in sulphuric acid, or by roasting and oxidizing certain zinc ores. Formerly called also vitriol of zinc.

Green \Green\ (gr[=e]n), a. [Compar. Greener (gr[=e]n"[~e]r); superl. Greenest.] [OE. grene, AS. gr[=e]ne; akin to D. groen, OS. gr[=o]ni, OHG. gruoni, G. gr["u]n, Dan. & Sw. gr["o]n, Icel. gr[ae]nn; fr. the root of E. grow. See Grow.]

1. Having the color of grass when fresh and growing; resembling that color of the solar spectrum which is between the yellow and the blue; verdant; emerald.

2. Having a sickly color; wan.

   To look so green and pale.
   --Shak.

3. Full of life and vigor; fresh and vigorous; new; recent; as, a green manhood; a green wound.

   As valid against such an old and beneficent government as against . . . the greenest usurpation.
   --Burke.

4. Not ripe; immature; not fully grown or ripened; as, green fruit, corn, vegetables, etc.

5. Not roasted; half raw. [R.]

   We say the meat is green when half roasted.
   --L. Watts.

6. Immature in age, judgment, or experience; inexperienced; young; raw; not trained; awkward; as, green in years or judgment.

   I might be angry with the officious zeal which supposes that its green conceptions can instruct my gray hairs.
   --Sir W. Scott.

7. Not seasoned; not dry; containing its natural juices; as, green wood, timber, etc.
   --Shak.

8. (Politics) Concerned especially with protection of the enviroment; -- of political parties and political philosophies; as, the European green parties. Green brier (Bot.), a thorny climbing shrub ( Emilaz rotundifolia) having a yellowish green stem and thick leaves, with small clusters of flowers, common in the United States; -- called also cat brier. Green con (Zo["o]l.), the pollock. Green crab (Zo["o]l.), an edible, shore crab ( Carcinus menas) of Europe and America; -- in New England locally named joe-rocker. Green crop, a crop used for food while in a growing or unripe state, as distingushed from a grain crop, root crop, etc. Green diallage. (Min.)

   1. Diallage, a variety of pyroxene.

   2. Smaragdite. Green dragon (Bot.), a North American herbaceous plant ( Aris[ae]ma Dracontium), resembling the Indian turnip; -- called also dragon root. Green earth (Min.), a variety of glauconite, found in cavities in amygdaloid and other eruptive rock, and used as a pigment by artists; -- called also mountain green. Green ebony.

      1. A south American tree ( Jacaranda ovalifolia), having a greenish wood, used for rulers, turned and inlaid work, and in dyeing.

      2. The West Indian green ebony. See Ebony. Green fire (Pyrotech.), a composition which burns with a green flame. It consists of sulphur and potassium chlorate, with some salt of barium (usually the nitrate), to which the color of the flame is due. Green fly (Zo["o]l.), any green species of plant lice or aphids, esp. those that infest greenhouse plants. Green gage, (Bot.) See Greengage, in the Vocabulary. Green gland (Zo["o]l.), one of a pair of large green glands in Crustacea, supposed to serve as kidneys. They have their outlets at the bases of the larger antenn[ae]. Green hand, a novice. [Colloq.] Green heart (Bot.), the wood of a lauraceous tree found in the West Indies and in South America, used for shipbuilding or turnery. The green heart of Jamaica and Guiana is the Nectandra Rodi[oe]i, that of Martinique is the Colubrina ferruginosa. Green iron ore (Min.) dufrenite. Green laver (Bot.), an edible seaweed ( Ulva latissima); -- called also green sloke. Green lead ore (Min.), pyromorphite. Green linnet (Zo["o]l.), the greenfinch. Green looper (Zo["o]l.), the cankerworm. Green marble (Min.), serpentine. Green mineral, a carbonate of copper, used as a pigment. See Greengill. Green monkey (Zo["o]l.) a West African long-tailed monkey ( Cercopithecus callitrichus), very commonly tamed, and trained to perform tricks. It was introduced into the West Indies early in the last century, and has become very abundant there. Green salt of Magnus (Old Chem.), a dark green crystalline salt, consisting of ammonia united with certain chlorides of platinum. Green sand (Founding) molding sand used for a mold while slightly damp, and not dried before the cast is made. Green sea (Naut.), a wave that breaks in a solid mass on a vessel's deck. Green sickness (Med.), chlorosis. Green snake (Zo["o]l.), one of two harmless American snakes ( Cyclophis vernalis, and C. [ae]stivus). They are bright green in color. Green turtle (Zo["o]l.), an edible marine turtle. See Turtle. Green vitriol.

         1. (Chem.) Sulphate of iron; a light green crystalline substance, very extensively used in the preparation of inks, dyes, mordants, etc.

         2. (Min.) Same as copperas, melanterite and sulphate of iron.

            Green ware, articles of pottery molded and shaped, but not yet baked.

            Green woodpecker (Zo["o]l.), a common European woodpecker ( Picus viridis); -- called also yaffle.

n. (context dated English) Old name for iron(II) sulfate (FeSO₄).