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.
Sulfate is any salt or ester made up of sulphuric acid. Sulfide is used to describe any of three types of chemical compounds that contain sulfur. Sulfite is sulfur dioxide, or SO2.
In fact, the term sulfur (or sulfa) allergy should be avoided because it is confusing. It is more likely that you are allergic to sulfates, sulfites, sulfhydryls or sulfonamides, which are forms of sulfur that are commonly used in making medications and in preserving foods.