opson(in)-o, opsin-o
opsonin
elast-o, elastic-o
elastic tissue
colla-gen-o
collagen
kary-o
nucleus
steat-o
fat
onc-o
tumor
arsen-o, arsenic-o
arsenic
album(in)-o
albumin
hygr-o
moisture
amyl-o
starch
vitr(e)o
glass
anthrac-o
carbon
kerat-o
horn
pur(in)-o
purine
prot-e(in)-o
protein
myx-o
mucus
in-o, inos-o
fiber
hydr-o
water
ferr-o
iron
seb-o
sebum
porph(yr)(in)-o
porphyrin
myel-in-o
myelin
sacchar-o
sugar
calci-o, calc-i
calcium