| IR | drop of voltage across a resistor produced by a current; ileal resection; immune response; immunizat... |
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| OD | Doctor of Optometry; obtained absorbance; occipital dysplasia; occupational dermatitis; occupational... |
| egg drop syndrome | <syndrome> A disease of chickens caused by an adenovirus and characterised by production of soft-shelled and shell-less eggs in apparently healthy birds. (05 Mar 2000) |
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| toe-drop | Inability to dorsiflex the toes, usually due to paralysis of the toe extensor muscles. (05 Mar 2000) |
| enamel drop | A developmental anomaly in which there is a small nodule of enamel below the cementoenamel junction, usually at the bifurcation of molar teeth. Synonym: enamel drop, enamel nodule, enamel pearl. (05 Mar 2000) |
| foot-drop | Paralysis or weakness of the dorsiflexor muscles of the foot, as a consequence of which the foot falls, the toes dragging on the ground in walking; many causes, both central and peripheral. (05 Mar 2000) |