Thalassian is the language of the high elves, half-elves, half blood-elves, and blood elves — a derivative of the Darnassian language of the night elves. It has both written and spoken equivalents. Individuals who are unfamiliar with the language’s proper name may refer to it as high elven (not to be confused with the languageElven).
Like Nazja, Thalassian is derived from the Darnassian language.The elder tongue is almost forgotten.Hence, Thalassian is closely related to Darnassian and there is some overlap between the two languages. Further Darnassian utterances have therefore have been preserved in modern Thalassian.
So far, linguistic scholars have opted to err on the side of caution in documenting Darnassian terms and phrases that are also considered part of the Thalassian language. Certainly this issue, however delicate, merits further research. Nevertheless, addressing a blood elf (not a high elf, with perhaps a few exceptions, as they are a neutral faction now and some lean toward the alliance) with a Darnassian-specific word or phrase can be considered offensive or foolish, and so the speaker must handle the situation with care.
This is one of the four known elven dialects.
Thalassian Primer (official translations)
Here are a few common Thalassian phrases and words, for which the translations have been officially confirmed by Blizzard:
Al diel shala = Safe travels.
Anar’alah = “By the light”
Anar’alah belore = By the light of the sun.
Anaria shola = Speak your business.
Anar’endal dracon = By the breath of the dragon.
Ann’da = Papa
Anu belore dela’na = The sun guides us.
Bal’a dash, malanore = Greetings, traveler.
Ban’dinoriel = “Gatekeeper”
Band’or shorel’aran — (Roughly) “Prepare to say farewell”, spoken by Commander Sarannis, officially translated in the Chinese version of WoW.
Bash’a no falor talah! = Taste the chill of true death!, Sylvanas Windrunner (WC3)
Belore = “The sun”, though can mean to uncover something hidden or unknown if used in Darnassian.
Dalah’surfal = My love 
Doral ana’diel? = How fare you?
Felo’melorn = “Flamestrike”
Kim’jael = “Little Rat” Kim’jael Indeed!
Medivh = “Keeper of Secrets”
Minn’da = Mama
Quel’dorei = “high elves”,or “the high elves”.
Quel’Thalas = “High Kingdom” or “High Home”
Quel’Zaram = High Blade.
Quel’Danil = High Peak.
Ronae = “Peaceful” used in Lordaeron.
Selama ashal’anore = Justice for our people.
Shindu fallah na! = They’re breaking through!.
Shin’do Sin’dorei! = Glory to the Sin’dorei 
Shorel’aran = Farewell.
Sin’dorei = Children of the blood. This could also be interpreted as “people of the bloodline”, referring to the continuation of the line of the Highborne.this is also said to mean Blood Elves by Kael’thas Sunstrider
Tal anu’men no Sin’dorei! — Death to all who oppose the Children of the Blood. Reference
High elven namesEdit
The past is a burden to the high elves, yet they maintain naming rituals that are millennia old. Many of the names of elven priests and heroes have become the names used for elves in modern times. The high elves share a connection with the sun that is quite prevalent in their choice of family names.
- Male Names: Mariel, Athaniar, Anandor, Tharama, Viridiel, Malanior.
- Female Names: Anarial, Freja, Driana, Coria, Alanassori, Melanion, Azshara.
- Family Names: Boughstrider, Dawnblade, Lightbringer, Morningray, Suntreader.
Untranslated words or phrases Edit
- An’daroth — One of the three Ghostlands Darnassian spy encampments. Possibly Darnassian?
- An’owyn — One of the three Ghostlands Darnassian spy encampments. Possibly Darnassian?
- An’telas — One of the three Ghostlands Darnassian spy encampments. Possibly Darnassian?
- Aranal, ledel! - Prince Keleseth
- Anara’nel belore — Kael’thas= May you all go through the fire.
- Balamore shanal! — Kael’thas
- Bandal! — High Nethermancer Zerevor
- Belesa menoor! — High Nethermancer Zerevor
- Diel fin’al. — High Nethermancer Zerevor
- Elrendar — a Quel’Thalas river and a waterfall, both fed by a lake with the same name.
- Endala finel endal! — Nethermancer Sepethrea
- Endorel aluminor — High Botanist Freywinn
- Falthrien — an arcane academy on Sunstrider Isle.
- Falithas — One of the runestones protecting Eversong from the plague.
- Felomin ashal — Kael’thas in Magister’s Terrace
- Quel’Danas — Island home of the dragonhawks and location of the Sunwell.
- Quel’Lithien — A quel’dorei lodge in Eastern Plaguelands, and location of the Silvermoon City Register.
- Selama am’oronor! — High Nethermancer Zerevor
- Selama amor’anore! — Gathios the Shatterer
- Shalandis — An island off the coast of the western Ghostlands, headquarters of Darnassian spying missions against Silvermoon City.
- Shan’dor — One of the runestones protecting Eversong from the plague.
- Tal anu’men no Sin’dorei! — High Astromancer Solarian
- Tel’thas - Dagger of the Blood King
- Thalas’din belore - inscripted on Fal’inrush, Defender of Quel’thalas.