• Galtonian inheritance
• Gamete
• Gamma ray
• Gamolenic acid
• Ganglia
• Ganglion
• GBR
• Gelatin
• Genetic discrimination
• Gengou phenomenon
• Genotype
• GERD
• German measles
• Gerstmann syndrome
• Glacial acetic acid
• Glanzmann's thrombasthenia
• Glasgow's sign
• Glaucoma
• Glioma
• Gliosis
• Gonorrhea
• Granulocyte
• Graves' disease
• Great pox
• Grey Turner sign