1) In the work of JRR Tolkien, this is an elvish word used to refer to elves. More specifically, it refers to elves who made the journey west in the First Age, and their descendants (as opposed to the "dark elves" or Avari). All the major elven characters in Tolkien's novels are eldar.
2) In the Warhammer 40,000 (Games Workshop)universe, the Eldar are a race of aliens who live on Craft-worlds. Broadly good in alignment, they are divided into different units of bizarrely coloured guilds and crafts. Basically, futuristic elves. They dress in slim, streamlined armour with pointed helmets, and have many special units relying on otherworldly technologies and magic - including some which look remarkably like Star Wars speeder bikes, others which resemble floating disks, and giant godlike beings known as Avatars.
Eldar sounds a bit like a cross between "elder" and "elf".
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The Eldar.. They refer to humans as the 'Mon-Keigh'.
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Someone who is very caring, intelligent, kind and charismatic. Changes things from the inside, always cares about those around him.
Eldar changed the way everything was just by being himself.
Men name. The holder of this name is very sexy, charming and knows what a woman wants. He is womenβs most wanted, flirty, man with a true man attitude. If you want to feel a real woman you should definitely be right on with Eldar.
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All people named Eldar are hot, flirty and tall. At first they will act bitchy, but how time goes they will be more and more funny to talk. They are perfect for an relationship.
You: Omg, look at this hot guy! I am in love.<3
Friend: Yeah, his name is Eldar.
Eldar: *wink *
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Mostly smart and intellectual people, although their intelligence they are not great sporters and pretty lazy, if you've ever met an Eldar he is probably pretty small or has slow growth.
"Look at that small nerd! He's probably an Eldar!"
"Eldar - obviously - passed the exam with a perfect grade of 100!"
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Dark Eldar are a Xenos race in the Warhammer 40k universe, this race of Xenos are Eldar who are so fucked up not even those who are into the BDSM fetish would wish to partake. Some of these Xenos are anywhere between 10,000 to 35,000 years old and even some of them were still alive before they accidentally birthed a new Chaos god by the name of Slaanesh by their blood orgies and depravity that is beyond all description, logic, reasoning or understanding.
These Xenos live on Commorragh, which is essentially a massive city state in the Webway, essentially a place where nobody of sane mind would go because of how dangerous and perverse it is. The Dark Eldar have their own version of the sick twisted freak from the Emperor's Children Legion Fabius Bile, however these freaky darlings are the Homonculi, monstrous beings who delight in experimentation of the unfortunates they enslave or get their fingers on.
Take a look at these Dark Eldar, hard to believe that they were just like Eldar at one point of time.