I was reading Jealousy article and from most of the comments it could be suggested that Taurus is prone to jealousy. So was wondering what single characteristic (positive/negative) could describe a sign?

I'm not sure exactly what you mean. I think with Taurus though the "negative" trait is not so much jealousy but greed. Which of course could translate to jealousy - they want their stuff - including you, if you are "theirs".

well Elsa has had it right all along  - Quirky = Aquarian

and leo = proud,

I have both of these in my chart sooo..

I dunno, I'm the least jealous Taurus you've ever met. "Mine" doesn't necessarily mean I can't share, thanks. So I'm not terribly fond of that being the #1 defining characteristic.

Maybe Taurus is more like, "stuff" or "holding?"

I'm a Taurus sun and I guess I wouldn't say I'm really jealous but  perhaps a bit possessive. Like Vajra said, we tend to see lovers/friends as "ours." But it's not about greed, it's about being possessive. Taurus can be very giving, you'd just better show your appreciation if you don't want them getting all huffy. ;D

Like jenfullmoon said, "mine" doesn't mean we can't share! Just very protective over the people we care about. I don't think jealousy is a good word to describe us, possessive and protective over what we already have is a lot more accurate. I've never met a Taurus who had a problem with jealousy or greed, but they have all been very particular about their belongings, whether those belongings are material possessions or people!

Ah, it makes sense. Also I was more after a single word which could describe different signs. Like "...Quirky = Aquarian and leo = proud". 

Taurus = logical and stable.

Leo = Always on stage.