Meaning

Yes.

"The greater part of the whole" means the largest (or most important) part of a unit.

"The part of the greater whole" -- First, the grammar is wrong. It should be "A part of the greater whole." That said, "a part of the greater whole" means a part (of any size) which belongs to a larger unit.

Clear?

Doctor D First, the grammar is wrong. It should be "A part of the greater whole."

Actually the real sentence is ' to emphasize the part of a greater whole' which is a definition of the word 'highlight' in a book ,the question is that ,it could either be something like ' to emphasize the greater part of a whole ' or as you said ' to emp

Even with the longer sentence, I would not use "the part." I would use either "a part" or "one part."
"The part" suggests that there is only a single part (and that is logically impossible).

bmojtabaActually the real sentence is ' to emphasize the part of a greater whole'

That doesn't look like a sentence to me. It's just a phrase. What is the whole sentence? Doesn't it start with more words? Doesn't it continue with more words?

CJ

You're right that's just a phrase , as I already said it's a definition for the word ' highlight ' in a Toefl book ,but the definition was weird to me

bmojtabait's a definition for the word ' highlight '

Yes, but my question is, is that all there is?

highlight: to emphasize the part of a greater whole

It doesn't continue with an "of" phrase or a "which" or "that" phrase?

CJ

CalifJimis that all there is?

Yes ,that's all

bmojtabaYes ,that's all

It's strange that they used 'the part' instead of 'a part' in that case.