xy·loid 
(zīloid′)
(zīloid′)adj.
Relating to, consisting of, or resembling wood: xyloid lignite.
- petrification
- Petrified Forest
- petrify
- Petrine
- petro-
- petrochemical
- petrochemistry
- petrodollars
- petrogenesis
- petrogenetic
- petroglyph
- petroglyphic
- Petrograd
- petrographer
- petrographic
- petrographical
- petrographically
- petrography
- petrol
- petrolatum
- petroleum
- petroleum coke
- petroleum ether
- petroleum jelly
- petrolic