di·va·lent 
(dī-vālənt)
(dī-vālənt)adj.
1. Chemistry Having a valence of 2.
2. Immunology
a. Having two sites of attachment. Used of an antibody or antigen.
b. Containing antigens from two strains of a microorganism or virus. Used of a vaccine or serum.
- paratactically
- parataxis
- paratenic host
- parathion
- parathyroid
- parathyroidectomy
- parathyroid gland
- parathyroid hormone
- paratroop
- paratrooper
- paratroops
- paratype
- paratyphoid fever
- paratypic
- paraurethral gland
- paravane
- Paraíba
- Paraíba do Sul
- parboil
- parbuckle
- Parcae
- parcel
- parcel post
- parcenary
- parcener