| Words | Parts of Speech | Meaning/Definition/Similar Words |
|---|---|---|
| aid-major | noun | The adjutant of a regiment. |
| aigremore | noun | Charcoal prepared for making powder. |
| ailanthus | noun | Same as Ailantus. |
| air brake | A railway brake operated by condensed air. | |
| air-built | adjective | Erected in the air; having no solid foundation; chimerical; as, an air-built castle. |
| air-drawn | adjective | Drawn in air; imaginary. |
| air drill | A drill driven by the elastic pressure of condensed air; a pneumatic drill. | |
| air level | Spirit level. See Level. | |
| airometer | noun | A hollow cylinder to contain air. It is closed above and open below, and has its open end plunged into water. |
| air plant | A plant deriving its sustenance from the air alone; an aerophyte. | |
| air poise | An instrument to measure the weight of air. | |
| air shaft | A passage, usually vertical, for admitting fresh air into a mine or a tunnel. | |
| air stove | A stove for heating a current of air which is directed against its surface by means of pipes, and then distributed through a building. | |
| air-tight | adjective | So tight as to be impermeable to air; as, an air-tight cylinder., A stove the draft of which can be almost entirely shut off. |
| aitchbone | noun | The bone of the rump; also, the cut of beef surrounding this bone. |
| aitiology | noun | See Aetiology. |