retro-
retro-
Metro
Tube
petrol
teal
astro-
astr-
intro-
intro-
hetero-
hetero-
nekro-
necro-
neuro-
neuro-
xero-
xero-
Retina
retina
Retronym
retronym
Retorte
retort
Retten
rescue
retten
save
rescue
escape
recover
Retter
rescuer
Metrum
meter
Petr
Peter
Petrus
Peter
Tetris
Tetris
Betrag
amount
absolute value
magnitude