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        | a- (an- before a vowel or a h) |  | Definition 
 
        | not, without, lacking, deficient |  | 
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        | anti- (ant- often before a vowel or h; hyphenated before i) |  | Definition 
 
        | against, opposed to, preventing, relieving |  | 
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        | difficult, painful, defective abnormal |  | 
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        | ecto- (ect- often before a vowel) |  | Definition 
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        | en- (em- before b, m, and p) |  | Definition 
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        | endo-, ento- (end-, ent- before a vowel) |  | Definition 
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        | epi- (ep- before a vowel or h) |  | Definition 
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        | outside, from the outside, toward the outside |  | 
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        | half, partial; (often) one side of the body |  | 
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        | over, above, excessive, beyond normal |  | 
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        | hypo- (hyp- before a vowel or h) |  | Definition 
 
        | under, deficient, below normal |  | 
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        | mono- (mon- before a vowel or h) |  | Definition 
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        | syn- (sym- before b, p, and m; the n assimilates or is dropped before s) |  | Definition 
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