- gene mapping
- gene extinction
- gene mutation
- gene frequency method
- gene rearrangement
- gene therapy
- gastronome
- grey eye
- gray atrophy
- grey layer
- grey hepatization
- ground itch
- given to prattling (out of indignation
- global variable
- general knowledge
- global lock
- global search
- global variable symbol
- genetically
- gibbens catheter
- glans penis
- glistering
- glittery
- glinting
- glistening
- gobbet
- green paper
- grade school
- green salad
- golf course
- globe trotting
- gentian
- globalise
- globalize
- give the bird
- gap. foliar
- golden chance
- genitofemoral
- guck
- genus piper
- gunk
- goo
- grid chart
- gas pedal
- gnathoplasty
- giant cell myeloma
- gynaecography
- geniculopulvinar fibre
- go downhill
- gigartina pistillata