Sentence:  A work by <WSD>Androcydes</WSD>, called "On the Pythagorean Symbola" (Περὶ Πυθαγορικῶν συμβόλων), may have been in existence as early as the fourth century, but was definitely in circulation by the first century BCE. 
Meaning of the word marked with <WSD> tags:  A Pythagorean who lived before the 1st century BCE and possibly as early as the 4th.