(roofing) an impregnated, saturated, or coated felt placed as the first ply in some low-slope roof systems.

The resistance to forces that cause or tend to cause two contiguous parts of a body to slide relative to each other in a direction parallel to their contrast.

(construction) A roof having only one sloping plane and no hips, ridges or valleys.

(roofing) Sheet material, such as reinforced kraft paper, rosin-sized paper, polyester scrim or polyethylene sheeting, placed between two components of a roof assembly to ensure that no adhesion occurs between them and to prevent possible damage from chemical incompatibility, wearing or abrasion of the membrane.

plural of shell-like

Having a similar shape to a seashell. / (literary, dated) Of the external ear, resembling the graceful convolutions of a seashell.

(slang, Britain, Australia, especially in set phrases) The ear.

(cooking) A wide, flat metal pan suitable for baking in an oven.

(colloquial, vulgar, humorous) It is fruitless to speculate about counterfactual situations.

(archaeology) A shallow cave-like opening at the base of a bluff or cliff, a frequent location of prehistoric archeological sites.