Poly- means many

polychromatic (adj) - having many different colors

polyclinic (n) - a hospital that treats many different kinds of diseases

polydactyl (adj) - having many fingers or toes (more than the normal person

polyglot (n) - a person who knows how to speak, read, or write many languages

polygon (n) - a closed plane figure with many straight lines that connect

polygraph (n) - a machine that writes down many different changes in the body while the person answers questions; a lie detector test

polyhedron (n) - a solid figure with many sides, such as a pyramid

polymorphous (adj) - having or assuming many different forms

polysyllabic (adj) - having many syllables

polytheism (n) - the belief in many different gods