gian - guar
- gravity
- gravity cell
- gravity navigation
- gravity-wave duct
- gray
- gray box
- Gray code
- gray filter
- gray gradation
- gray hologram
- gray level
- gray scale
- gray scale tracking
- gray tone
- gray-body radiator
- Gray-code test patterns
- gray-level co-occurrence matrix
- gray-level difference
- gray-level histogram
- gray-level image
- gray-level probability density
- gray-map editor
- gray-scale test chart
- gray-tone display
- graybody
- grayish
- grayscale
- grayscale image
- grayscale scanner
- grazing angle
- grazing incidence
- grd
- great circle distance
- great minds think alike
- great primer
- great-circle bearing
- great-circle cut
- great-circle path
- great-circle propagation
- greater than
