0 a metal instrument that is put into a long narrow part of the body in order to open it up so it can be examined:
1 an area of brightly coloured feathers on ducks and some other birds:
The brown duck has a distinctive large blue speculum.
He picked up his speculum from a small metal tray and started his examination.
The inside of your nose may need to be examined with a nasal speculum.
The speculum keeps the walls of the vagina apart so that the cervix can be seen.
The Mallard has a bright blue-purple speculum.
It is smaller than a Mallard, with a shorter bill, more pointed tail, and a green speculum.
The north-eastern race is darker and has a brighter bill and blue speculum.
