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| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
retention re·ten·tion (rĭ-těn'shən)
n.
Involuntary withholding by the body of wastes or secretions that are normally eliminated.
The holding by the body of what normally belongs in it, such as food in the stomach.
An ability to recall or recognize what has been learned or experienced; memory.
In dentistry, a period following orthodontic treatment when a patient wears an appliance or appliances to stabilize the teeth in their new position.