these definitions are taken from my site, hope it helps clear up some common misconceptions
there are a few thai words we should know when dealing with plakats.
pla = fish
kat = to bite
plakat thai = siamese fighting fish
plakat par = a general term for all wildtype plakat
plakat cheen = cheen is used to identify anything chinese. plakat cheen is used to identify long finned "veil tail" type bettas ("chinese style silk robe"). cheen indicates long fins and iridescence.
plakat mor = domestic hybrid fighters, traditionally bred in clay pots (mor).
plakat tung = wild fighters from the flooded rice fields, ditches, backwaters and marshes (tung).
plakat luk sang ka see = the offspring (luk) of a fighting strain crossed with a wild plakat.
sang ka see = galvanized iron sheets. commonly used to describe the hard scales of these fighters.
pla sang = a shortened definition of plakat luk sang ka see
the below definitions are from precha's excellent website plakatthai.com and are used by breeders of plakat mahachai
Luk Bang = Fighters caught in the swamp areas.
Luk Thod = offspring of fighters to look like the real wild caught fighter.
Luk Sub = offspring of fighters from cross breeds.
Luk Sard = offspring of fighters from fry that were freed in the swamp area.
Luk Kratang = offspring of the captive fighters.
Plakat Keaw = green fighter (betta smaragdina)