Term: ozone layer: a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun
Broader: layer: a relatively thin sheetlike expanse or region lying over or under another | Unrelated: criticism: disapproval expressed by pointing out faults or shortcomings
Broader: layer: a relatively thin sheetlike expanse or region lying over or under another | Unrelated: smooth plane: a small plane for finish work
Broader: layer: a relatively thin sheetlike expanse or region lying over or under another | Unrelated: saccharin: a crystalline substance 500 times sweeter than sugar; used as a calorie-free sweetener
Broader: layer: a relatively thin sheetlike expanse or region lying over or under another | Unrelated: saint: a person who has died and has been declared a saint by canonization
Broader: layer: a relatively thin sheetlike expanse or region lying over or under another | Unrelated: teratogen: any agent that interferes with normal embryonic development: alcohol or thalidomide or X-rays or rubella are examples
Broader: layer: a relatively thin sheetlike expanse or region lying over or under another | Unrelated: playback: the act of reproducing recorded sound
Broader: layer: a relatively thin sheetlike expanse or region lying over or under another | Unrelated: sannup: a married male American Indian
Broader: layer: a relatively thin sheetlike expanse or region lying over or under another | Unrelated: ax head: the cutting head of an ax
Broader: layer: a relatively thin sheetlike expanse or region lying over or under another | Unrelated: stamp mill: a mill in which ore is crushed with stamps
Broader: layer: a relatively thin sheetlike expanse or region lying over or under another | Unrelated: fertilization membrane: the membrane that forms around a fertilized ovum and prevents penetration by additional spermatozoon