histidyl his·ti·dyl (hĭs'tĭ-dĭl')
n.
The univalent radical, C6H8N3O2, of histidine.
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
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