Rabi/o
rage or madness
Rachi/o
spinal columb or vertebrae
radi/o
radiation or the radius (bone in distal forelimb)
radiat/o
giving off radiant energy
Radicul/o
root or nerve root
Ram/o
branch
Raph/o
seam or suture
-raphy
suturing
Re-
back or again
recept/o or recipe/o
receive
rect/o
rectum or straight
recuperate/o
to recover
reduct/o
to bring back together
refract/o
to bend back or turn aside
regurgit/o
to flood or gush back
remiss/o
to let go or give up
Ren/o
kidney
restor/o
to rebuild
resuscit/o
to revive
retent/o
to hold back
reticul/o
network
Retin/o
nervous tissue of the eye (retina) or net
Retract/o
to draw back
retro-
behind or backwards