Huh. The only dragons on
this list, they are hatched from eggs
as wyrmlings and reach great wyrm status given time.
This
chapter details these minor clans, some of whom are wicked
and predatory, others beneficial and beatific."
The chapter details Amphi, Aquatic, Fire Frost, Sea and Shadow Dragons.
This leaves Magic of Incarnum, Dragons of Faerun and Shining South
Page 12 of Dragons of Faerun covers the Mercury, Steel, Mist and Rattleyr dragons.
So the only universally accepted true dragon that even NEEDS a definition is the Incarnum Dragon. So just a rules-based definition that includes the Incarnum Dragon but excludes Dragonwrought Kobold will suffice.
[spoiler]Monster Manual 1 -all covered by RotD
Black
Blue
Green
Red
White
Brass
Bronze
Copper
Gold
Silver
Monster Manual 2 -all covered by RotD
Amethyst
Crystal
Emerald
Saphire
Topaz
Oriental Adventures -all covered by RotD
Chiang Lung
Li Lung
Lung Wang
Pan Lung
Shen Lung
T'ien Lung
Tun Mi Lung
Yu Lung
Draconomicon -all covered by RotD
Battle
Chaos
Ethereal
Fang
Howling
Oceanus
Pyroclastic
Radiant
Rust
Shadow
Styx
Tarterian
Races of the Dragon
Dragonwrought Kobolds(maybe)
Drow of the Underdark -all covered by RotD (originally in Monsters of Faerun)
Deep
Magic of Incarnum
Incarnum
Sandstorm -all covered by RotD
Sand
Epic Level Handbook -all covered by RotD
Prismatic
Force
Monsters Of Faerun -all covered by RotD
Brown
Song
Dragons of Faerun -all covered by DoF
Mercury -covered in Dragons of Faerun
Steel -covered in Dragons of Faerun
Mist
Shining South -all covered by DoF
Rattelyr
Bestiary of Krynn -all covered by DoK
Amphi
Aquatic
Fire
Frost
Dragonlance:The age of mortals -all covered by DoK
Sea[/spoiler]
And yes, that is moving the goalpost. But what are you going to do about it?
Edit:
In case anyone cares about the Wizard logo on Dragon Compendium...page 195:
[spoiler]Some sages believe that these five icons of evil
are but the most common of dragons. A radical
and oft derided theory holds that the chromatic
dragons have three "lost" siblings, the orange, purple,
and yellow dragons. According to this theory, the
chromatic dragon Tiamat once had a long forgotten
sister and rival. Tiamat's sister, her name long since
lost to history, spawned the three forgotten dragons
shortly before her demise at her sister's fangs and
claws.
Between the depredations of Tiamat's true
children and their own small numbers, the three
dragons teetered on the edge of extinction. Yet, as
true dragons they were too mighty to suffer an easy
defeat. Over the millennia, they have slowly clawed
their way back from oblivion.[/spoiler]