ab chaos lex

ab, a prep. with abl. (1) of motion or measurement in space, [from, away from]. (2) of time, [from, after.] (3) of separation, difference, change, [from] ; so of position or number, [counting from] ; and of the relation of part to whole, [out of, of]. (4) of origin and agency; especially with passive verbs, [by, at the hands of, because of]. . . .

chaos acc. Chaos , abl. Chao, n. [boundless empty space]. Hence [the lower world]; personified, [Chaos, the father of Night and Erebus; the shapeless mass out of which the universe was made].

lex legis f. law, statute /covenant, agreement; [a set form of words , contract, covenant, agreement]; 'leges pacis', [conditions of peace]; esp. [a law, proposed by a magistrate as a bill, or passed and statutory]; 'legem iubere', [to accept or pass a bill]; in gen., [a precept, rule].

N.B. A handy site for your late night Latin questions:

24 Hour Translations -- online Latin Dictionary

As for your late night Greek questions,

not so simple. But try Translatum, a scary-looking

site with lots of info where members have kindly

formed an ancient Greek translation board. Check

out here discussing logos. (And no, not adverts.)