Letters that make tetra
a, e, r, t are letters that make 'tetra'
tetrad, tetras, Tetrao are words created by adding a letter to 'tetra'
1 possible definitions for 'tetra'
Under this definition, tetra is a noun and has the following properties:
'tetra' can be a type of characin, characin fish, characid.
'tetra' can be a member of Hemigrammus, genus Hemigrammus.