Adjective : the undersurface speed of a submarine.    From Dictionary.com. 

They appear late in March, being green above, with an undersurface which is white, and cottony.    From Wordnik.com.  [Herbal Simples Approved for Modern Uses of Cure] Reference

I bet it didn't take an hour to get to the undersurface of the ice.    From Wordnik.com.  [Mother Of Storms]

She made her undersurface even more super slippery, and felt the boat pick up speed.    From Wordnik.com.  [Roc and a Hard Place]

My mount reared back and presented the entire undersurface of its wings to the onrushing air.    From Wordnik.com.  [Petty Pewter Gods]

The undersurface has a small upholstered pad attached so it becomes a padded arm for the chair.    From Wordnik.com.  [Archive 2009-03-01] Reference

They fell into the air and for a few seconds the curve of the town's undersurface formed a ceiling.    From Wordnik.com.  [Sun of Suns] Reference

This evergreen oak possesses leathery leaves with a dense, felt-like indumentum on the undersurface.    From Wordnik.com.  [Hengduan Mountains subalpine conifer forests] Reference

If we dug down, I imagine we'd find the gravel undersurface, and maybe the drainage system, as well.    From Wordnik.com.  [The Waste Lands]

The sky was a low sheet of steel-colored billows, like the undersurface of murky water; the air smelled of snow.    From Wordnik.com.  [The Silicon Mage]

He had covered less than half the possible undersurface when his fingers caught the edge of something on the rocks.    From Wordnik.com.  [Rostnikov's Vacation]

So if you pile too much linguine Alfredo into your thighs, the undersurface of the skin will actually tear see Figure B.1.    From Wordnik.com.  [You: On a Diet] Reference

The cap of a basidiomycete, an expanded structure at the top of the stipe that bears the hymenium (gills, etc.) on its undersurface.    From Wordnik.com.  [Medallion Vulcan | SciFi, Fantasy & Horror Collectibles] Reference

He imagined the ship dangling upside down on the undersurface of the Earth, the giant fingers of gravity holding them firmly in place.    From Wordnik.com.  [Ender's Game]

The drawer fronts had come fitted easily between the undersurface of the cafeteria table's top and the folded polygonal section, being only veneered three-ply.    From Wordnik.com.  [The Vatican Rip]

Leaves may be sclerophyllous or coated on the undersurface with appressed hairs to conserve water, and they remain evergreen throughout an extended dry season.    From Wordnik.com.  [Yunnan Plateau subtropical evergreen forests] Reference

VACR visual aircraft recognition variable geometry movable wings ventral fin stabilizing surface attached to the undersurface of an aircraft, commonly called a belly fin.    From Wordnik.com.  [FM 44-80 Visual Aircraft Recognition - Glossary]

Projecting in a bold curve whose undersurface is gaily painted in arabesque, their thick bars and narrow openings nevertheless leave a gloomy impression on the mind, while they add to the Oriental character of the city.    From Wordnik.com.  [The Atlantic Monthly, Volume 06, No. 34, August, 1860] Reference

Seay said the injury was called a Grade 2 undersurface tear.    From Wordnik.com.  [Bless You Boys] Reference

Soffit-undersurface of a horizontal element of a building, especially a roof overhang.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Rough pads on undersurface of hands and feet increase traction while the koala is climbing.    From Wordnik.com.  [xml's Blinklist.com] Reference

The upper surface of the leaf blade is hairy near the base; the undersurface is usually hairless.    From Wordnik.com.  [news | SJ | http://www.goupstate.com] Reference

The lashes of your lower eyelid can brush a foreign object from the undersurface of your upper eyelid.    From Wordnik.com.  [All MayoClinic.com Topics] Reference

The bed on which they rest is about an inch in thickness, and is stained with iron on its undersurface.    From Wordnik.com.  [The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation] Reference

She crawls toward the undersurface of the skin and emits an irritating chemical that gives you a blister.    From Wordnik.com.  [Thestar.com - Home Page] Reference

Forces between this lower airstream and the wing's undersurface provide some of the lift that supports the wing.    From Wordnik.com.  [nourishing obscurity] Reference

(par-uh-THEYE-royd) A set of four small glands on the undersurface of the thyroid gland that function in the endocrine system.    From Wordnik.com.  [parathyroid glands] Reference

The tint of the undersurface varies much, but it is always some ashy brown or reddish colour, which matches with those of dead leaves.    From Wordnik.com.  [The Malay Archipelago, the land of the orang-utan and the bird of paradise; a narrative of travel, with studies of man and nature — Volume 1] Reference

They create a hydrophobic seal that closes the pores, preventing the paint from adhering to the undersurface and allowing it to be wiped off.    From Wordnik.com.  [EurekAlert! - Breaking News] Reference

This means that the undersurface of the chair, table, doorknob, etc., would not be reached by the light, and therefore, it would not be disinfected.    From Wordnik.com.  [zanesvilletimesrecorder.com - Local News] Reference

With the bindings little more than a few leather straps and the undersurface wrapped with metal, the overall effect is terrifying, as I discovered when I tried them.    From Wordnik.com.  [Travel news, travel guides and reviews | guardian.co.uk] Reference

Steep Roof Terms Eave - horizontal edge at he low side of a sloping roof Fascia - exposed vertical surface of an eave Soffit-undersurface of a horizontal element of a building.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Rubbing of palate, gums, undersurface of tongue and teeth involves activation of huge brain areas associated with these regions and is an important way of rousing our consciousness when we get up in morning.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

A drop of a thousand feet; we shot downward past all the deserted levels, past the ground-level, the undersurface transportation lanes, the sub-river tubes, the sub-cellar, down to the very bottom of the city.    From Wordnik.com.  [Wandl the Invader] Reference

Also, and I don’t mean to sound picayune, but it’s enough with the reflecting undersurface!.    From Wordnik.com.  [DataPortability Launches New Logo Contest] Reference