rosehead

noun6

1. •
   The head or blossom of a rose.

   • He's here, I've heard, day after day, following you round while you snip off roseheads. — 1986
2. •
   A many-sided pyramidal head upon a nail.

   • In the Fort Southwest Point collection, hand-wrought iron nails headed in the "rosehead" pattern account for a total of 3,549 specimens (38% of hand-wrought nails). — 1993
3. •
   A nail with that kind of head.

   • The gadroon strips have been reset, their roseheads countersunk. — 1985
4. •
   A bur or gouge that has a spherical head and curled blades, resembling the curled petals of a rose.

   • The rosehead is a most effective gouge for removing carious bone, as well as a very convenient instrument for enlarging cloacae to allow of an exploration for sequestra. — 1864
5. •
   A conical drillbit that has radiating blades.

   • The rosehead bit has a series of cutters, nine in all, that radiate from the centre point. — 1984
6. •
   A circular or spherical nozzle or end to something that is perforated to allow the escape of liquid or gas.

   • To this I attach a rosehead like that of an ordinary deggin-can, and have it placed, pointing upwards, directly underneath and near to my patient's nostrils. — 1860