to membrane

To cover something with a thin layer of a substance

Make something visible by removing a cover or letting light reach it

Remove a cover to show what is under it

Acting or feeling very silly and not thinking clearly, often as a joke

A thin flexible outer layer around a cell that controls what enters and leaves

A moist inner layer lining body openings that makes sticky fluid to protect and keep them wet

A thin flexible layer around a cell that controls what enters and leaves it

A thin skin between the outer ear and the middle ear that vibrates when sound hits it

A thin transparent third eyelid that protects and keeps the eye wet

A thin layer that surrounds and protects a developing baby in the womb

A thin layer that lets some small particles pass but blocks others

A thin stiff membrane inside the inner ear that carries sound vibrations to help hearing

A thin membrane with many blood vessels in bird and reptile eggs that helps the embryo breathe and grow

A thin skin that sometimes covers a baby's head when it is born

A thin, web-like middle layer that covers the brain and spinal cord

A thin layer that forms around a fertilized egg to stop other sperm

A bone that forms directly in soft tissue instead of from cartilage, like skull and collar bones

A thin material with tiny holes that removes particles and germs from liquids or air

To make a thin layer that covers and protects a surface

A serious lung problem in babies born too early that makes breathing hard

A thin clear layer inside the eye that holds the jelly in front of the retina

A thin layer of tissue that lines spaces inside the chest or abdomen and makes a slippery fluid

A thin tissue inside a joint that makes fluid to keep the joint moving smoothly

A thin fold of skin that partly covers the entrance to the vagina and is present at birth