What is "stromateus triacanthus"

dollar \dol"lar\, n. [D. daalder, LG. dahler, G. thaler, an abbreviation of Joachimsthaler, i. e., a piece of money first coined, about the year 1518, in the valley (G. thal) of St. Joachim, in Bohemia. See Dale.]

1. (a) A silver coin of the United States containing 371.25 grains of silver and 41.25 grains of alloy, that is, having a total weight of 41

2. 5 grains. (b) A gold coin of the United States containing 2

3. 22 grains of gold and 2.58 grains of alloy, that is, having a total weight of 25.8 grains, nine-tenths fine. It is no longer coined.

   Note: Previous to 1837 the silver dollar had a larger amount of alloy, but only the same amount of silver as now, the total weight being 416 grains. The gold dollar as a distinct coin was first made in 1849. The eagles, half eagles, and quarter eagles coined before 1834 contained 2

4. 75 grains of gold and 2.25 grains of alloy for each dollar.

   2. A coin of the same general weight and value as the United States silver dollar, though differing slightly in different countries, formerly current in Mexico, Canada, parts of South America, also in Spain, and several other European countries.

   3. The value of a dollar; the unit of currency, differing in value in different countries, commonly employed in the United States and a number of other countries, including Australia, Canada, Hong Kong, parts of the Carribbean, Liberia, and several others.

   Chop dollar. See under 9th Chop.

   Dollar fish (Zo["o]l.), a fish of the United States coast ( Stromateus triacanthus), having a flat, roundish form and a bright silvery luster; -- called also butterfish, and Lafayette. See Butterfish.

   Trade dollar, a silver coin formerly made at the United States mint, intended for export, and not legal tender at home. It contained 378 grains of silver and 42 grains of alloy.

Butterfish \But"ter*fish`\, n. (Zo["o]l.) A name given to several different fishes, in allusion to their slippery coating of mucus, as the Stromateus triacanthus of the Atlantic coast, the Epinephelus punctatus of the southern coast, the rock eel, and the kelpfish of New Zealand.