Tetra is greek
Quad is latin
The difference between the two is PTFE stands for Poly Tetra Fluoro Ethylene, which is DuPont's Teflon. TFE is Tetra Fluoro Ethylene, which is an odorless, tasteless gas and is deadly.
Quadri (Latin) and Tetra (Greek) are both prefixes used for the number 4
Greek prefixes for numbers mono di tri tetra penta hexa hepta octa ennea deca
Prefixes meaning 4 are quad (Latin) and tetra (Greek).
You can tell the difference between a male and female Serpae Tetra by their size. The females body is larger or rounder than the males.
Greek prefixes for numbers mono di tri tetra penta hexa hepta octa ennea deca http://wiki.answers.com/What_are_the_different_Greek_prefixes&action=edit
The first five prefixes used in molecular compounds are: 1 mono-, 2 di-, 3 tri-, 4 tetra- and 5 penta-.
There is no specific difference between the males and females of the Columbian tetra (Hyphessobrycon colombianus). The female will develop a plumpness in the lower abdomen close to the vent when they are full of ova and ready to spawn.
mono, di, tri, tetra, pent, hex, hept, oct, nona, dec.
Greek prefixes for numbers mono - one di - two tri - three tetra - four penta - five hexa - six hepta -seven octa - eight ennea - nine deca - ten