| lead tetroxide | A bright orange-red powder that turns black when heated; used in ointments and plasters. Synonym: red lead, red oxide of lead. (05 Mar 2000) |
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| limb lead | One of the three standard leads (leads I, II, III) or one of the unipolar limb lead's (aVR, aVL, aVF). (05 Mar 2000) |