Sentence:  What then of the actual fine of thirty <WSD>minae</WSD> Socrates proposes? Thirty <WSD>minae</WSD> was a large sum, “the equivalent of approximately eight-and-one-half years′ wages," according to one recent estimate (Brickhouse and Smith 1988, 227); enough to buy a library of three thousand philosophy books, if the price of Anaxogoras′ book is any guide (26d6-e2). 
Meaning of the word marked with <WSD> tags:  A monetary unit of ancient Greece and the Middle East, originally equivalent to the weight of a mina of silver. (From 15th C.)