1. (biology) a hypothesis of directed evolution (as opposed to natural selection of random variations)

Encyclopedia: Orthogenesis

• torso
• tort
• torte
• tortellini
• tortfeasor
• torticollis
• tortilla
• tortilla chip
• tortillon
• tortious
• tortoise
• tortoise plant
• tortoiseshell
• tortoiseshell butterfly
• tortoiseshell turtle
• tortoiseshell-cat
• tortricid
• tortricid moth
• Tortricidae
• tortrix
• tortuosity
• tortuous
• tortuously
• tortuousness
• torture