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quarter horse

(Encyclopedia)quarter horse, American breed of light horse that originated during the colonial era, partly from Arabian ancestry (see Arabian horse). The name refers to the horse's reputation for speed at the quart...

palmitin

(Encyclopedia)palmitin pălˈmətĭn [key], fat that is the triglyceride of palmitic acid, CH3(CH2)14CO2H, i.e., the tripalmitate ester of glycerol. It is a white crystalline solid at ordinary temperatures, insolub...

ammonium nitrate

(Encyclopedia)ammonium nitrate, chemical compound, NH4NO3, that exists as colorless, rhombohedral crystals at room temperature but changes to monoclinic crystals when heated above 32℃. It is extremely soluble in ...

embolus

(Encyclopedia)embolus ĕmˈbələs [key], foreign matter circulating in and obstructing a blood vessel. It may be a portion of a clot that has separated from the wall of a vessel (see thrombosis), a bubble of gas o...

Staffordshire terrier

(Encyclopedia)Staffordshire terrier, breed of strong, muscular terrier developed in England in the early 19th cent. It stands from 17 to 19 in. (43.1–48.3 cm) high at the shoulder and weighs from 35 to 50 lb (15....

tannin

(Encyclopedia)tannin, tannic acid, or gallotannic acid, astringent vegetable product found in a wide variety of plants. Sources include the bark of oak, hemlock, chestnut, and mangrove; the leaves of certain sumac...

Brussels griffon

(Encyclopedia)Brussels griffon, breed of sturdy toy dog developed in Belgium in the 18th and 19th cent. It stands about 8 in. (20.3 cm) high at the shoulder and weighs from 6 to 12 lb (2.7–5.5 kg). There are two ...

benzoic acid

(Encyclopedia)benzoic acid bĕnzōˈĭk [key], C6H5CO2H, crystalline solid organic acid that melts at 122℃ and boils at 249℃. It is the simplest aromatic carboxylic acid (see aryl group and carboxyl group). In ...

Werner, Abraham Gottlob

(Encyclopedia)Werner, Abraham Gottlob äˈbrähäm gôtˈlōp vĕrˈnər [key], 1750–1817, German geologist. In 1775 he became inspector and teacher in the mining academy at Freiberg, which through his efforts be...

affenpinscher

(Encyclopedia)affenpinscher ăfˈənpĭnˌshər [key], breed of toy dog perfected in Europe at the end of the 19th cent. It stands from 8 to 10 in. (20.3–25.4 cm) high at the shoulder and weighs about 8 lb (3.6 k...