| abalone |
a large sea snail that has several shiny colors on the inside of its shell. Abalone are mollusks. People eat abalone meat and make decorations from the shells. |
| air conditioning |
a system that cools air throughout a certain space. Air conditioning is used inside buildings and cars. |
| amphibian |
a small animal that spends part of its life cycle in water and part of its life cycle on land. Amphibians hatch in water and breathe with gills. Then they develop lungs so the adults can breathe air. Amphibians are cold-blooded animals with skeletons inside their bodies. Frogs, toads, and salamanders are amphibians. [1/2 definitions] |
| annual ring |
one of the rings of wood on the inside of a tree that can be seen when the tree is cut into logs. Each ring represents a year of growth. |
| Aquadag |
in electronics, trademark for the graphite coating on the inside of some cathode ray tubes. |
| arctic |
(often capitalized) the region around the North Pole and inside the Arctic Circle. [1/3 definitions] |
| Argand burner |
an oil or gas burner having a metal tube inside a cylindrical wick, through which air is conducted directly to the flame. |
| arthropod |
a large group of animals with hard shells on the outsides of their bodies, legs with joints, and no bones inside their bodies. Insects, spiders, centipedes, and crabs are arthropods. |
| atrium |
a courtyard inside a building, either open to the sky or with a glass ceiling. [1/2 definitions] |
| auto body |
the main part of a car; the part of a car that you sit inside. |
| bar1 |
a long piece of solid material used to support something, hold something together, or keep something outside or inside. [1/3 definitions] |
| barouche |
a four-wheeled carriage with a folding top, two opposing seats for two people each inside, and a driver's seat outside in front. |
| beanbag |
a small cloth bag with dried beans or pellets sealed inside, used as a plaything. [1/2 definitions] |
| belly |
the deepest inside part of something. [1/5 definitions] |
| be on to |
(informal) to have inside information about. |
| berlin |
a large four-wheeled closed carriage with separate perches for the footman and driver, and two facing seats inside. [1/2 definitions] |
| bird |
an animal with two wings, two feet, and a body covered with feathers. Most birds can fly. Birds are warm-blooded animals with skeletons inside their bodies. Birds lay eggs with hard shells. Robins, eagles, chickens, and ostriches are a few of the many kinds of birds. |
| bladder |
an organ inside the body that collects urine. The bladder gets larger when it fills and smaller when it becomes empty. |
| bone |
the hard parts inside of a person or animal. |
| box spring |
a cloth-covered bedspring having rows of individual but connected helical springs inside a boxlike frame. |
| brain |
the organ in the body that controls thought, movement, and feeling. The brain is inside the skull. |