You should try talking about it to your teacher then. Most editions of Othello will also provide meanings for words that you may not understand. For future reference you are going to have to rely more on your own skills rather than others'.
Just as a starting point, look through portions of the play where Othello is referring to Desdemona. I am sure there must be some descriptive words Othello uses to describe Desdemona early in the play, as well as near the end of the play. For example, just scrolling through the play myself, this verse displays how initially, Othello bestowed Desdemona highly:
"It gives me wonder great as my content
To see you here before me. O my soul's joy! (he is happy to see her)
If after every tempest come such calms,
May the winds blow till they have waken'd death! (he is able to endure bad events if he is rewarded with seeing her)
And let the labouring bark climb hills of seas
Olympus-high and duck again as low
As hell's from heaven! If it were now to die,
'Twere now to be most happy; for, I fear, (if he were to die now, he would be happy because of her)
My soul hath her content so absolute
That not another comfort like to this
Succeeds in unknown fate." (he has not known any other happiness like this)
And then compare it with Othello's descriptions of Desdemona at a later stage of the play:
"Was this fair paper, this most goodly book,
Made to write 'whore' upon? What committed! (was her pretty appearance made to be unfaithful underneath?)
... Impudent strumpet!" ('strumpet' is essentially a prostitute or promiscuous woman)
"Yet she must die, else she'll betray more men." (he comes to believe he must murder her or her infidelity will spread)
"She turn'd to folly, and she was a whore.
... She was false as water." (basically he is convinced of her deception)
. True that ^