(dim'pÄl), 1. A natural indentation, usually circular and of small area, in the chin, cheek, or sacral region. 2. A depression of similar appearance to a dimple, resulting from trauma or the contraction of scar tissue. 3. To cause dimples. /dimÂ·ple/ (dimÂ´p'l) a slight depression, as in the flesh of the cheek, chin, or sacral region. postanal dimple a dermal pit near the tip of the coccyx, indicative of the site of attachment of the embryonic neural tube to the skin.