1. (biology) a scientific theory of the origin of species of plants and animals
   - theory of evolution, evolutionism

Type of: scientific theory

• illustrative
• illustratively
• illustrator
• illustrious
• illustriously
• illustriousness
• Illyria
• Illyrian
• Ilmen
• ilmenite
• ILO
• Ilosone
• ilx
• ilxx
• ilxxx
• Ilya Ehrenberg
• Ilya Grigorievich Ehrenberg
• Ilya Ilich Metchnikov
• image
• image breaker
• image compression
• image orthicon
• image scanner
• imager
• imagery