| pilonidal | Denoting the presence of hair in a dermoid cyst or in a sinus opening on the skin. Origin: pilo-+ L. Nidus, nest (05 Mar 2000) |
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| pilonidal cyst | A special kind of abscess that occurs in the cleft between the buttocks. Forms frequently in adolescence after long trips that involve sitting. (12 Dec 1998) |
| pilonidal fistula | A dimple in the crease between the buttocks. (12 Dec 1998) |
| pilonidal sinus | A dimple in the crease between the buttocks. (12 Dec 1998) |
| cyst, pilonidal | A special kind of abscess that occurs in the cleft between the buttocks. Forms frequently in adolescence after long trips that involve sitting. (12 Dec 1998) |
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