A membrane.
The amnion which encloses the foetus before birth, especially that part of it which sometimes shrouds a baby’s head at birth (traditionally considered to be good luck).
The surface of a press that makes contact with panel product, especially a removable plate or sheet.
An entry to a mill lead taken from a burn or stream (a mill lead (or mill waterway) is generally smaller than a canal but moves a large volume of water).
Caul fat.
A strip or block of wood used to distribute or direct clamping force.
A style of close-fitting circular cap worn by women in the sixteenth century and later, often made of linen.
The thin membrane which covers the lower intestines; the omentum.
A permeable or semipermeable membrane.
In a speaker, the thin, semi-rigid membrane which vibrates to produce sound.
A thin opaque structure with a central aperture, used to limit the passage of light into a camera or similar device.
Any of various membranes or sheets of muscle or ligament which separate one cavity from another.
A floor slab, metal wall panel, roof panel or the like, having a sufficiently large in-plane shear stiffness and sufficient strength to transmit horizontal forces to resisting systems.
A contraceptive device consisting of a flexible cup, used to cover the cervix during intercourse.
A flexible membrane separating two chambers and fixed around its periphery that distends into one or other chamber as the difference in the pressure in the chambers varies.
In mammals, a sheet of muscle separating the thorax from the abdomen, contracted and relaxed in respiration to draw air into and expel air from the lungs; also called thoracic diaphragm.
To reduce lens aperture using an optical diaphragm.
To act as a diaphragm, for example by vibrating.