arowanaAny of various large freshwater fish belonging to the family Osteoglossidae (especially from genera Heterotis, Osteoglossum, and Scleropages), found in South America, Southeast Asia, Australia, and Africa. These fish are mainly carnivorous and are characterized by large, bony scales, a toothed tongue, and a wide, slanted mouth.
ArowhananAn age from 95.2 to 92.1 million years ago, a subdivision of the Cretaceous.
aroylAny univalent radical R-CO- derived from an aromatic carboxylic acid
aroylationReaction with, or conversion to an aroyl group
arpeggiationThe act of arpeggiating, of spreading a chord out instead of playing the notes simultaneously.
arpeggiatorA feature of some synthesizers that automatically steps through a sequence of notes based on an input chord, thus creating an arpeggio.
arpeggioThe notes of a chord played individually instead of simultaneously, usually moving from lowest to highest.
arpeggioneA six-stringed musical instrument of the 19th century, fretted and tuned like a guitar but bowed like a cello, and held vertically between the knees.
arpentA premetric French unit of length, having various official measures (from 58 to 72 meters).
arpilleraA patchwork picture made predominantly by women in Chile, especially as a form of underground protest during the military dictatorship (1973–90) of Augusto Pinochet.
arraignmentThe formal charging of a defendant with an offense; in many jurisdictions it includes their response in the form of a plea, typically as guilty, not guilty, or no contest.
ArramA hamlet in Leconfield parish, East Riding of Yorkshire, England (OS grid ref TA0444).
arrastraA device formerly used by gold-miners for grinding auriferous quartz, crudely resembling a mortar and pestle, with the crushing element dragged around by horse or mule.
arraswiseexhibiting the top and two sides, the corner being in front (said of a rectangular form).
arratelA traditional Portuguese unit of mass, usually equivalent to 459 g.
arrhizotonicwhose stressed syllable is in the suffix
arrhizousHaving no root: applied to parasitical plants which have no root, but adhere to other plants by any part of their surface, and derive their nourishment from them; also to mosses and Hepaticœ which are destitute of rhizoids.
arrhythmiaAn irregular heartbeat; a lack of a regular pulse.