noun, plural abacuses, abaci. [ab-uh-sahy, -kahy, uh-bak-ahy] /ËÃ¦b ÉËsaÉª, -ËkaÉª, ÉËbÃ¦k aÉª/ (Show IPA) 1. a device for making arithmetic calculations, consisting of a frame set with rods on which balls or beads are moved. 2. Architecture. a slab forming the top of the capital of a column. Origin of abacus.
Quick Answer. Sulfa is a type of pharmaceutical drug that contain sulfonamides. Sulfonamides are compounds that contain nitrogen, hydrogen, oxygen and the sulfur they take their name from. Sulfur is a chemical that is extremely small and unlikely to cause allergic reactions on its own, unlike sulfonamides. Continue Reading.
Sulfates, also spelled sulphates, are used in a variety of common products and processes. Sodium lauryl sulfate is a strong detergent used for removing oils and grease and is found in household cleaning products, face and body washes and shampoos. Sodium sulfate is used in the manufacturing of glass and paper. Zinc sulfate is used to preserve wood. Sulfides, also spelled sulphides, come in three classes: organic sulfides, inorganic sulfides and phosphine sulfides. Organic sulfides are compounds in which sulfur is bonded to two organic groups.