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Children's Dictionary
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asphalt a sticky black substance like tar. Asphalt is found naturally or obtained when oil is refined. It is used for making roads and roofs and for making things waterproof. [1/2 definitions]
bioluminescence light given off naturally by certain kinds of insects, fish, or bacteria. The bioluminescence of fireflies allows them to blink on and off in the dark.
cobblestone a naturally rounded stone about the size of a fist, at one time used to pave streets.
fluent able to speak or write easily and naturally.
immune protected from a disease, either naturally or by getting a vaccine. [1/2 definitions]
native an animal or plant found naturally in a given place. [1/6 definitions]
of course naturally. [1/2 definitions]
organic produced or producing naturally, without using pesticides or other added chemicals. [1/2 definitions]
ozone a form of oxygen that occurs when oxygen is exposed to an electrical charge, like lightning. It is found naturally in Earth's atmosphere.
pack1 a group of animals that are alike and stay together naturally. [1/9 definitions]
salt water water with naturally occurring salt in it, such as the water in the sea. [1/2 definitions]
species a group of living things that naturally produce young with other members of the same group but not with those of other groups.
stone a piece of rock shaped naturally or cut for use in building or some other particular use. [1/6 definitions]
wind1 air as it moves naturally over the surface of the earth. [1/4 definitions]