( k´t ) (KEY) , official texts of ancient Rome, written or carved on stone or metal. Usually acta were texts made public, although publication was so...
( k ´st ks) (KEY) [Gr.,=the facts about hearing], the science of sound, including its production, propagation, and effects. Various branches of acou...
measure of land area used in the English units of measurement. The acre was originally the area a yoke of oxen could plow in a day and therefore diffe...
material used to grind, smooth, cut, or polish another substance. Natural abrasives include sand, pumice, corundum, and ground quartz. Carborundum (si...