| Answer | Crossword Clue |
|---|---|
| fluting | A groove or set of grooves forming a surface decoration |
| flutings | A groove or set of grooves forming a surface decoration |
| riblets | any of a series of microscopic grooves set into a material that is applied to the exterior surface of aircraft or boats to reduce drag |
| riblet | any of a series of microscopic grooves set into a material that is applied to the exterior surface of aircraft or boats to reduce drag |
