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

Encyclopedia: Orthogenesis

• Sid Caesar
• Sida
• Sida hermaphrodita
• Sida rhombifolia
• Sida spinosa
• Sidalcea
• Sidalcea malviflora
• Siddhartha
• Siddons
• side
• side by side
• side chain
• side chair
• side chapel
• side dish
• side door
• side drum
• side effect
• side entrance
• side horse
• side judge
• side of bacon
• side of beef
• side of meat
• side of pork