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nounthe SI unit of energy absorbed from ionizing radiation; equal to the absorption of one joule of radiation energy by one kilogram of matter; one gray equals 100 rad
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- rings gymnastic apparatus consisting of a pair of heavy metal circles (usually covered with leather) suspended by ropes; used for gymnastic exercises
- bars gymnastic apparatus consisting of two parallel wooden rods supported on uprights
- trampoline gymnastic apparatus consisting of a strong canvas sheet attached with springs to a metal frame; used for tumbling
- gesso gypsum or plaster of Paris spread on a surface to make it suitable for painting or gilding (or a surface so prepared)
- family podocarpaceae gymnosperms with simple persistent needlelike or scalelike leaves
- gnetophytina gymnospermous flowering plants; supposed link between conifers and angiosperms; in some systems classified as a class (Gnetopsida) and in others as a subdivision (Gnetophytina or Gnetophyta)
- horizontal bar gymnastic apparatus consisting of a bar supported in a horizontal position by uprights at both ends
- podocarpaceae gymnosperms with simple persistent needlelike or scalelike leaves
- parallel bars gymnastic apparatus consisting of two parallel wooden rods supported on uprights
- gnetopsida gymnospermous flowering plants; supposed link between conifers and angiosperms; in some systems classified as a class (Gnetopsida) and in others as a subdivision (Gnetophytina or Gnetophyta)