under- (too little, below) underdevelop, underdevelopment, underestimate, undergraduate, underground, underlie , underline, undersea, underlying , undermine , underneath, underwear
neo- (new) neo-Nazism, neolithic
be- (cause to be or have) befriend, belittle
bio- (life) biology, biography , autobiography, antibiotic, biochemistry, biosphere, biomedical
en- em- (cause to become, put into the stated condition) embody, empower, endanger, enlarge, enrich, encompass, enthrone, entrench
extra- (outside, beyond) extracurricular, extraordinary
mid- (middle) midday, midnight
poly- (many) polycentric, polydirectional, polysyllabic
pseudo- (not real, false) pseudomemory, pseudonym, pseudoscience