an·ti·mat·ter 
(ăntē-măt′ər, ăntī-)
(ăntē-măt′ər, ăntī-)n.
A form of matter that is identical to ordinary matter except that it is composed of antielectrons (positrons), antiprotons, and antineutrons.
- polycarpic
- polycarpous
- polycarpy
- polycentric
- polycentrism
- polychaete
- polychaetous
- polychlorinated biphenyl
- polychromatic
- polychromatophile
- polychromatophilia
- polychromatophilic
- polychrome
- polychromic
- polychromophilia
- polychromous
- polychromy
- Polycleitus
- polyclinic
- Polyclitus
- polyclonal
- polyclonally
- polyconic projection
- polycyclic
- polycyclic aromatic hydrocarbon