1. noun /ˌhaɪɹəˈɡlɪfɪk/
a) a writing system of ancient Egypt, Maya and other civilizations, using pictorial symbols to represent individual sounds as a rebus
b) any symbol used in this system; a hieroglyph
2. adjective /ˌhaɪɹəˈɡlɪfɪk/
a) of, relating to, or written with this system of symbols
b) difficult to decipher
Wikipedia foundation.