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atmo (ex: atmosphere, atmospheric)
vapor
cardio (ex: cardiovascular, cardiology)
heart
cosmo (ex: cosmopolitan, cosmos)
world or universe
counter (ex: counterargument, counteract)
against
cranio (ex: craniology, craniotomy)
skull
cyclo (ex: cyclone, bicycle)
circle
gno (ex: agnostic)
know
oss (ex: ossunary)
bone
xylo (ex: xylophone, xylograph)
wood
monger (ex: fishmonger, warmonger)
seller
sept (ex: september, septangular)
seven
xeno (ex: xenophobia, xenophile)
stranger
vas (ex: vascular, vase)
vessel
fore (ex: forehead, forecast)
front
ish (ex: greenish, smallish)
like
less (ex: fruitless, hopeless)
without
baro (ex; barometer, barometric)
pressure
ferro (ex: ferromagnet)
iron
quasi (ex: quasi-military, quasi-stellar)
somewhat
nesia (ex: Polynesia)
island
lepsy (ex: epilepsy, narcolepsy)
attack
let (ex: piglet, booklet)
little
nano (ex: nanogram)
billionth
pico (ex: picogram)
trillionth
ideo (ex: ideology)
idea