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oscitancy
Osco-Umbrian
oscular
osculate
osculum
-ose (1)
-ose (2)
OSF
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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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