Lining
A lining was any coating surrounding a object. 

Otherwise unfortunate events (dark clouds) that had at least one good feature were said to have a silver lining. (, )

The outer hull of  was lined with duranium. ()

In 2153, Malcolm Reed noted that the linings of antimatter relays were coated with a platinum-cobalt alloy that  might be able to separate. ()

Later that year, Reed noted that a bulkhead of the Seleya had been partially lined with trellium. ()

In 2365, Wesley Crusher noted that the lining of the 's warp core was still smooth. ()

Also that year, Lwaxana Troi accused the Antedian delegates to the Pacifica conference of being assassins, as they had robes lined with ultritium that were meant to explode, killing many. ()

In 2378, Seven of Nine gave B'Elanna Torres and Tom Paris a pair of baby booties lined with biothermal insulation to keep their bundle of joy's feet warm. ()

Later that year, The Doctor noted that a member of Otrin's species had used magnesite to line a jury-rigged environmental suit, which had offered limited protection. ()

Anatomical linings
 Stomach lining/Intestinal lining/Villus (Humans)
 Cartilaginous tongue lining  (Bolians)
 Vascular lining (Humans)

See also
 Lining one's pockets

Clothing