tetra = four
allotetraploid
hexamethylenetetramines
oxytetracycline
tri = three
tricycle
tripod
triceratops
di = two
dictionary
dictator
diocese
mono = one
monolith
ammono
monopoly
neon
ne
10
calcium
ca
20
flurine
f
9
potassium
k
19
argon
ar
18
oxegyn
o
8