What does the "though" mean here? Is it an adverb or a conjunction?
Where is the object of the "define"?isn't it a transitive verb?[Image]

Question

Answer

Though is a conjunction here as it's linking the two things.  You could change it to 'but only':

For "Is" and "Is-Not" but only with Rule and Line,

The object of define is basically everything before it:

I could define "Is" and "Is-Not" with rule and line and "Up-and-Down" without rule and line.

Answer

Just so you know - this is poetry, and old-fashioned language. It's very difficult even for native speakers to make sense out of this.