BINARY COMPOUND • FREE TRANSLATOR.ORG • Definition of Binary compound

... silica, and which, as before stated, are usually called syenitic. Syenite originally received its name from the celebrated ancient quarries of Syene, in Egypt. It differs from granite in having hornblende as a substitute for mica, and being without quartz. Werner at least considered syenite as a binary compound of feldspar and hornblende, and regarded quartz as merely one of its ...

— The Student's Elements of Geology • Sir Charles Lyell

... and showed that these proportions had always a simple ratio to one another. This is the "law of multiple proportions." He laid down the following arbitrary rules for determining the number of atoms in a compound:—if only one compound of two elements exists, it is a binary compound and its atom is composed of one atom of each element; if two compounds exist one is binary (say A B) and the other ternary (say A 2B); if three, then one is binary and the others may be ternary (A 2B, ...

— Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 - "Chtelet" to "Chicago" • Various