Medical/Dental Terminology Prefixes

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a, an without
ab away from
ad toward
ante before
anti against, instead of
aut self, own
bi two
brady slow
circum around
contra against, opposite
di twice, double
dys difficult, abnormal
ecto outside of
endo-intra within
epi upon or over
hemi half
hyper above normal
hypo below normal
inter between
mal bad
mega/macro large
micro small
neo new
peri around/ surrounding
poly many, much
post after, behind
pre before, in front of
pro before, in front of
pseudo false
retro half
semi half
sub under
tachy fast
trans across, through
ultra beyond, in excess