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en-, em-, el- (Greek: in, into, inward; within; used as a prefix).

The en- changes to em- before b, p, or ph.

embolism:
embryo:
empathy:
emphasis:
emphysema:
emporium:
encephalitis:
encircle:
encyclical:
encyclopedia:
enemy:
energy:
engrave:
enopscilium:
enopsilosis:
enpodonyx:
enthusiasm:
enzootic:
enzyme: