MANY PEOPLE HAVE ASKED , SO HERE IS THE COMPLETE DEFINITION I hope its not too confusing but at least you get the idea of where the name comes from

~ ZATIRA
Created by a king on his half-Apollite children, there are two were-hunter branches. Katagaria, and Arcadian. However, the Greek Fates
didn't like the idea, and demanded their immediate destruction. When
the king refused, the Fates cursed them into a war between the species.
Were-Animals/ Clans
-Wolves- Lykos
-Bears- Ursulan
-Panther- Panthiras
-Leopards- Pardalia
-Snow Leopards- Niphetos Pardalia
-Cheetah- Helikias
-Tigers- Tigarian
-Hawks/Falcon- Gerakian
-Jaguar- Balios (The Arcadian half was wiped out by Savitar)
-Dragons (Generally Remain In The Past) - Drakos
-Jackals- Tsakali
-Lion- Litarian
Katagaria
Katagaria are creatures that hold animal hearts, but have the
ability to turn human. They wield magic easily, and travel in packs
forming strong family ties, only going near humans (and human form) for
food supplies and sex. They return to animal form when sleeping, eating
or injured. It is hard for them to be human in daylight or when hurt,
and only the most powerful magically can do it. Enemy to the Arcadians,
though in some rare cases Katagaria have mated with or switched base
forms (human or animal) with Arcadians. They have one destined mate,
(when they sleep together for the first time they get marks on their
palms) and if the two do not do that before three weeks are over, the
males become impotent, sterile and eventually cannot use magic (as sex
is they only way they can charge their powers.) The females also become
sterile, but are otherwise unaffected. Non-mated Katagari cannot become
pregnant or receive sexually-transmitted diseases.
Arcadian
Creatures that have human hearts, but can turn into animals (though
they return to human form when eating, sleeping or injured.) They also
wield magic, the most powerful being the Aristo. There are groups
called Sentinels, sent to hunt Katagaria Slayers, and guard Aristo's,
beings of incredible magical power, although they seldom just kill
Slayers, slaughtering any Katagaria they meet. On rare occasions
Arcadians have mated with or switched base forms with Katagaria. They
also travel in packs, often living mainly in the past where humans will
not notice the fighting, and the leader of each animal form attends the
Omegrion with the Katagari leaders (though the Arcadian Jaguars were
wiped out by Savitar because the leader "pissed him off.")
Powers
All Were-Hunters Have The Same Powers.
- Change Into The Opposite Form (i.e. Animals To Human, Vice Versa)
- Psychic Abilities.
-In-Human Strength
-In Animal Form Their Senses Rise
Weaknesses
There is only one main weakness; electric shocks will cause them to
continually shift forms, depending on the strength of the shock. A
strong enough one will force them out of their bodies so they become
ghosts. A special weapon that does this called a "Phaser" has been
developed. Although most Were-Hunters can use their powers through the
day, most revert to their base form because it is painful not to.
They're much stronger during the night, and often travel on motorcycles
if they don't "flash" (teleport.) During full moon, many young Were's
go wild, biting anything they come into contact with.
Sanctuaries
Certain Were-Hunters (like the Peltiers; Katagarian bears) run
Sanctuary's, where any Were can come if injured or hunted. There are
rules however; if a Were is judged insane, they are hunted (as is
anyone who attempts to help them) and banned from Sanctuary. No-one is
allowed to fight in a sanctuary, and if one starts the first to attack
is banned from that particular sanctiary. They are closely protected by
Savitar against non-were interference, and Daimons, Apollites and
Were-Hunters (as they are all related) are all protected classes- if
they are in a Sanctuary and someone attacks them (if the ruling family
cannot prevent it) then Savitar will be allowed to get involved. Humans
are allowed to visit and work in but are not a protected class, due to
Savitar's "all humans are vermin" mindset. It is also against the law
for humans to know what really goes on there, leading to few human
workers in any particular Sanctuary. The Omerigon decide who can run a
sanctury, and they may only be set up where needed. The two most well
known are The Inferno in Minnesota (a club run by Dante Pontis, a
Katagarian panther) and Sanctuary In New Orleans (run by the Peltiers.)
To keep in with the "no fighting" policy, the Sanctuary in New Orleans
has a warning system for their clientele when Acheron arrives (he is
the only Dark-Hunter who visits regularaly) in the form of the song
"Sweet Home Alabama." As he is sworn to kill all Daimons he finds and
they can often be found there it gives them the chance to leave before
he enters. This has caused problems, however, as often an unsuspecting
human will put the song on the jukebox, causing almost all the people
there (including Were-Hunters who are afraid of him) to run for cover.
Omegrion
The Omegrion is the Governing body for Were's and Arcadians, on the
Island of Naratiti (Savitars moving island they must be sommoned to to
find, as he "likes his privacy") and governed by Savitar; a Chthonian
(God Killer) and All That Was And Ever Shall Be Again, a being of
awesome power, cynicism, ruthlessness and sarcasm (he claims he does
not fight; "I just kill whoever annoys me.") He is the ultimate judge
and peacekeeper for Were's, protecting the Sanctuaries (though he is
rarely needed) and oversees the whole nation (it is not revealed who he
is or how he came to rule the council, and his attitude towards it
suggests it was not his choice.) He has few friends, those known being
Acheron (who he calls Grom, a surfer term for an under 15 year old,
showing he is far older than Ash, who himself is 11,000 years old)
Ash's wife, Tory and Simi, Ash's demon companion, whom he feeds on a
regular basis. He also has a strange relationship with Apollymi, Ash's
mother, which seems to be of mutual dislike and respect, and hints that
they know each other well and have done favours for each other in the
past have been dropped (Savitar convinced the other Chthonians not to
kill her for destroying the Atlantian Gods. Usually it seems they would
have killed her for killing one god, let alone an entire pantheon. This
also suggest he has great power/influence with the other Chthonians.)
Though he claims to be cynical and emotionless, he is an incredibly
loyal friend, willing to allow Ash and his family to