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| a gadget; dingus; thingumbob. |
| the offspring of a zebra and a donkey. |
retraction re·trac·tion (rĭ-trāk'shən)
n.
The act of drawing back or in; shrinking.
The act of pulling apart, usually as part of a surgical procedure.
The posterior movement of teeth, usually with the aid of an orthodontic appliance.