n. alpha ray
bat ray
beta ray
cathode ray
cathode ray tube
cosmic ray
death ray
delta ray
dual energy X ray absorptiometry
eagle ray
electric ray
gamma ray
manta ray
medullary ray
phloem ray
pith ray
ray flower
roentgen ray
vascular ray
wood ray
x ray
X ray
X ray astronomy
X ray diffraction
X ray star
X ray source
X ray therapy
X ray tube
xylem ray