1. A theory (popular in the 18th century and now discredited) that an individual develops by simple enlargement of a tiny fully formed organism (a homunculus) that exists in the germ cell
   - preformation

Type of: theory

• genus Doliolum
• genus Dombeya
• genus Doodia
• genus Doronicum
• genus Dorotheanthus
• genus Doryopteris
• genus Dovyalis
• genus Draba
• genus Dracaena
• genus Draco
• genus Dracocephalum
• genus Dracontium
• genus Dracula
• genus Dracunculus
• genus Dreissena
• genus Drepanis
• genus Drimys
• genus Dromaius
• genus Drosera
• genus Drosophila
• genus Drosophyllum
• genus Dryadella
• genus Dryas
• genus Drymarchon
• genus Drymoglossum