| IRD | infantile Refsum syndrome; isorhythmic dissociation |
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| Kd | dissociation constant; distribution coefficient; partition coefficient |
| Kw | dissociation constant of water |
| ODC | oritidine decarboxylase; ornithine decarboxylase; oxygen dissociation curve |
| pK | negative logarithm of the dissociation constant; plasma potassium |
| light-near dissociation | A stronger near pupil response than light response; due to weak pupillomotor input, Argyll Robertson pupil, dorsal midbrain syndrome, or to misdirection of ciliary muscle fibres into the iris sphincter. Synonym: light-near dissociation. (05 Mar 2000) |
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| longitudinal dissociation | Dissociation between parallel chambers of the heart, as between one atrium and the other or between one ventricle and the other, in contrast to dissociation between atria and ventricles. (05 Mar 2000) |