para-

1. by the side of, beside, by, past, to one side, aside from, amiss: parathyroid, parasite
2. beyond: paranormal
3. subsidiary to: paralegal, paramilitary
Chem.
1. an isomer, modification, polymer, derivative, etc. of (a specified substance): paraformaldehyde
2. characterized by substitutions in the 1, 4 position (opposite sides) in the benzene ring: usually italicized and hyphenated in chemical names: para-aminobenzoic acid
Med.
1. in a secondary or accessory capacity: parahormone
2. functionally disordered, abnormal: paramnesia
3. like or resembling: paratyphoid
Nuclear Physics the form of diatomic molecules in which nuclei have antiparallel spins: parahydrogen

See para- in American Heritage Dictionary 4