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osmunda
osnaburg
osprey
OSS
ossa
Ossa, Mount
ossature
ossein
osseous
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osmium tetroxide
os·mi·um te·trox·ide


noun 
Definition:
 
stain in electron microscopy: a colorless or yellow crystalline solid with an unpleasant-smelling poisonous vapor. Use: biological stain. OsO4
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