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

Encyclopedia: Orthogenesis

• subtle
• subtleness
• subtlety
• subtly
• subtonic
• subtopia
• subtotal
• subtract
• subtracter
• subtraction
• subtractive
• subtrahend
• subtreasury
• subtropic
• subtropical
• subtropics
• subtype
• Subularia
• Subularia aquatica
• subulate
• subunit
• suburb
• suburban
• suburban area
• suburbanise