Adjective : an airtight contract.    From Dictionary.com. 

A: Your point is well taken: it is not an air-tight bloc.    From Wordnik.com.  [Sharmine Narwani: A Candid Conversation With The Arab League's Amr Moussa - Peace Talks, One-State, Hezbollah, Iran and..."Foreign Fingers"] Reference

The coal is heated in air-tight retorts illustrated by A.    From Wordnik.com.  [An Elementary Study of Chemistry] Reference

But had Alcatrante realized that the chamber was air-tight?.    From Wordnik.com.  [The Girl and The Bill An American Story of Mystery, Romance and Adventure] Reference

"Is it your custom to lock people into air-tight chambers?".    From Wordnik.com.  [The Girl and The Bill An American Story of Mystery, Romance and Adventure] Reference

Some packers put meat in a copper which is rendered air-tight.    From Wordnik.com.  [Cattle and Their Diseases Embracing Their History and Breeds, Crossing and Breeding, And Feeding and Management; With the Diseases to which They are Subject, And The Remedies Best Adapted to their Cure] Reference

At home keep the coffee in air-tight jars or cans when not in use.    From Wordnik.com.  [Breakfast Dainties] Reference

Two air-tight cylinders, A and B, contain air at ordinary pressure.    From Wordnik.com.  [Scientific American Supplement, No. 488, May 9, 1885] Reference

Keep all groceries possible in air-tight labelled cans or glass jars.    From Wordnik.com.  [Armour's Monthly Cook Book, Volume 2, No. 12, October 1913 A Monthly Magazine of Household Interest] Reference

Make it as air-tight as possible by pasting thick paper all over the inside.    From Wordnik.com.  [Ontario Teachers' Manuals: Household Management] Reference

Marty brought in an armful of knotty chunks and fed the great, air-tight stove.    From Wordnik.com.  [The Mission of Janice Day] Reference

The box must be a sound wooden or metal box, and must be approximately air-tight.    From Wordnik.com.  [On Laboratory Arts] Reference

The air-tight tube was then locked down, and the missile was ready for its victim.    From Wordnik.com.  [Some Naval Yarns] Reference

To do that, they had to make the hatch between Spektr and the rest of Mir air-tight.    From Wordnik.com.  [Space Cadets] Reference

The door would not open; built with air-tight nicety, it did not budge in the least.    From Wordnik.com.  [The Girl and The Bill An American Story of Mystery, Romance and Adventure] Reference

The pneumatic system requires a pump, an air-tight tank, and pipes to the various outlets.    From Wordnik.com.  [Elements of Plumbing] Reference

The boxes are made air-tight, and the gas enters the first box at one of the lower corners.    From Wordnik.com.  [Illustrated Science for Boys and Girls] Reference

In other words, since the invention of air-tight stoves, thousands have died of slow poison.    From Wordnik.com.  [The Atlantic Monthly, Volume 14, No. 85, November, 1864] Reference

So closely do these two halves fit when closed that this middle tube is perfectly air-tight.    From Wordnik.com.  [Chatterbox, 1905.] Reference

After the fruit has been put into the can, it must be sealed so that it is perfectly air-tight.    From Wordnik.com.  [Ontario Teachers' Manuals: Household Science in Rural Schools] Reference

Grumman had been built to cruise in the high stratosphere, so it was as air-tight as a submarine.    From Wordnik.com.  [By Proxy] Reference

A marine said the plugs of wood made them air-tight, so that they wouldn't sink if they fell overboard.    From Wordnik.com.  [The Adventures of Uncle Jeremiah and Family at the Great Fair Their Observations and Triumphs] Reference

Having been kept closed and, as near as we could tell, air-tight, it was still in its original appearance.    From Wordnik.com.  [The American Family Robinson or, The Adventures of a Family lost in the Great Desert of the West] Reference

Some which were submitted in an air-tight bottle to the action of light gradually whitened next the glass.    From Wordnik.com.  [Field's Chromatography or Treatise on Colours and Pigments as Used by Artists] Reference

Its thickness and its property of being air-tight, will be easily observed to be its only causes of safety.    From Wordnik.com.  [Fire Prevention and Fire Extinction] Reference

Before you light your candle, be sure that windows are closed and the room is as air-tight as you can make it.    From Wordnik.com.  [Simple Sabotage Field Manual] Reference

The object in having the box nearly air-tight is to avoid air-currents, which would increase the rate of cooling.    From Wordnik.com.  [On Laboratory Arts] Reference

In these water is stored under suitable pressure in air-tight tanks, filled partly with water and partly with air.    From Wordnik.com.  [The Home Medical Library, Volume V (of VI)] Reference

Thus oil-skin and mackintosh, which are air-tight as well as water-tight, make most people feel very uncomfortable.    From Wordnik.com.  [The Art of Living in Australia ; together with three hundred Australian cookery recipes and accessory kitchen information by Mrs. H. Wicken] Reference

This consists of a barge fitted with an air-tight cabin provided with an air-lock, and having in the center of its floor.    From Wordnik.com.  [Scientific American Supplement, No. 488, May 9, 1885] Reference

A few really fine cakes can be made at a time, and kept in an air-tight box, with layers of paper between, for some time.    From Wordnik.com.  [Choice Cookery] Reference

When ready, the composition is drawn off from the bottom of the cooking kettles into pouring kettles which have air-tight hoods.    From Wordnik.com.  [The Building of a Book A Series of Practical Articles Written by Experts in the Various Departments of Book Making and Distributing] Reference

"I only said that such houses were better than those which are all winter closed by double windows and burnt-out air-tight stoves.".    From Wordnik.com.  [The Atlantic Monthly, Volume 14, No. 85, November, 1864] Reference

The bag-pipes consists of an air-tight leather bag having three to five apertures, each of which contains a fixed stock or short tube.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy"] Reference

It is applied as follows: the end of the house drain is plugged up with a proper air-tight plug, of which there are a number on the market.    From Wordnik.com.  [The Home Medical Library, Volume V (of VI)] Reference

It is wise to line the box with one thickness of heavy paper or with several thicknesses of newspaper, to make it as air-tight as possible.    From Wordnik.com.  [Ontario Teachers' Manuals: Household Science in Rural Schools] Reference