polychromatic- having many different colors
polyclinic- a hospital that treats many different kinds of diseases
polydactyl- having many fingers or toes (more than normal)
polyglot- a person who knows how to speak, read, or write many languages
polygon- a closed plane figure with many straight lines that connect
polygraph- a lie detector test
polyhedron- a solid figure with many sides, such as a pyramid
polymorphous- having or assuming many different forms
polysyllabic- having many syllables
polytheism- the belief in many different gods