A tribrachial biped means any humanoid creature having three arms and two legs (i.e. One-Eyed Jack from the 1st issue of the ongoing Gen13 series and also the Fire from Heaven Wildstorm crossover).
Tribrachial means having three arms (i.e. some aliens or monsters have three arms).
bi = two ped = having a foot biped has two feet
Biped
The word Quadribrachial means four arms in Latin language.
Bi is a prefix for two, so then biped is two footed. For example, humans are bipeds
The Biped stood there silently.
The word biped is a noun. A biped is an animal that goes around on two feet.
the biped ran as fast as he could
A duodecabrachial biped means any humanoid creature having twelve arms and two legs (i.e. Mr. Centipede from the James and the Giant Peach movie).
biped
An octobrachial biped means any humanoid creature having eight arms and two legs (i.e. the eight-armed alien postal sorter from Men in Black II).
Bicycle, Bilingual, Binoculars, Bifocal, Biped