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.
Sulfate is another form of sulphur that may result in an allergic reaction. Sulfate is found in injectable drugs such as morphine sulfate, and personal hygiene products such as laundry detergent, hand soap, shampoo and condition.