The instructions were that the landfill should remain wet/moist to create a safe protective membrane.

Other cells will, in time, give rise to the protective foetal membranes.

It has very low toxicity to higher organisms such as human cells, which have more complex and protective membranes.

The real estate bubble may have burst, but Jim, it seemed, was still encased within its glossy, protective membrane.

Meningitis is the swelling of the protective membrane that surrounds the brain.

Young specimens are covered entirely by an easily removed thin protective membrane.

The second pair has elongated and swollen tips, with reduced protective membranes.

The left and right third arms have protective membranes greater in width than the arm width.

The circular eyes are rather large and equipped with protective nictitating membranes.

Already the neck arteries had sealed themselves off and a protective membrane was forming.