germ (germicide, germaphobe, germs)
vital or related
greg (segregate, congregate, gregarious)
group
mar (marines, maritime, submarine)
sea
prim (primary, prime, primate)
first
pyro (pyrokinesis, pyrophobia, pyromania)
fire
clam (exclamation, declaim, clamorous)
cry out
plu (plus, plural, plurality)
more
tang (tangible, intangible, tangent)
touch
string (string, stringy, stringer)
bind
liber (liberty, liberate, liberal)
free
junct (junction, conjunction, adjunct)
join
clud (exclude, include, conclude)
close
se (secret, select, separate)
apart
trib (tribute, contribution, retribution)
pay
dign (dignify, dignity, dignitary)
worthy
luc (lucid, translucent, lucidity)
light
rupt (disrupt, erupt, corrupt)
break
grat (gratifying, gratitude, grateful)
pleasing
medi (median, meditate, medium)
middle
soph (philosophy, sophisticated, sophomore)
wisdom
curr (current, recurrent, undercurrent)
run
tempor (contemporary, temporarily, temporal)
time
migr (migrate, transmigration, migrant)
wander
trans (transfer, trans-saharan, transmit)
across
gamy (monogamy, polygamy, gamete)
marriage