13-letter words containing g, o, p, y
- xylographical — Xylographic.
- zoophysiology — the physiology of animals as opposed to humans
- zoopsychology — the psychology of animals
- zygapophyseal — one of the four processes of a vertebra, occurring in pairs that interlock each vertebra with the vertebrae above and below.
- zygosporangia — a sporangium that bears a zygospore.