tet·ra·va·lent 
(tĕt′rə-vālənt)
(tĕt′rə-vālənt)adj.
1. Chemistry Having valence 4.
2. Immunology
a. Having four sites of attachment. Used of an antibody or antigen.
b. Containing antigens from four strains of a microorganism or virus. Used of a vaccine or serum.
- African collared dove
- African daisy
- Africander
- African elephant
- Africanism
- Africanist
- Africanize
- Africanized honeybee
- African lily
- African mahogany
- African oil palm
- African sleeping sickness
- African swine fever
- African trypanosome
- African trypanosomiasis
- African violet
- African wild dog
- Afrikaans
- put across
- put all eggs in one basket
- put all one's eggs in one basket
- putamen
- put an a a stop to
- put an a halt stop to
- put an end/a halt/a stop to