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amoeba a tiny living thing made of only one cell. Amoebas move by changing their shape. They eat by wrapping their bodies around their food. Amoebas live in fresh and salt water, soil, and in animals. Most kinds of amoebas can only be seen through a microscope.
asteroid a small, rocky, planet-like body that circles the sun and is mostly found between the orbits of Jupiter and Mars. The size of an asteroid can vary from very tiny to six hundred miles across.
atom anything extremely small; tiny bit. [1/2 definitions]
bacterium singular form of bacteria. Bacteria are tiny living things made up of one cell each. Bacteria live in most living things and in all parts of the earth. Most bacteria are useful to people, but some are harmful because they can cause disease.
bug (informal) a tiny microphone hidden for the purpose of listening to and recording voices secretly. [1/6 definitions]
capillary a tiny blood vessel joining the end of an artery to the beginning of a vein.
capsule a tiny case that holds one dose of medicine. Capsules are made of gelatin and dissolve when swallowed. [1/2 definitions]
cell a tiny unit of plant or animal life, having a nucleus and surrounded by a very thin membrane. [1/4 definitions]
chalk a soft, white limestone that comes mostly from tiny sea shells. [1/3 definitions]
chigger the tiny larva of a mite that lives in the skin of animals and causes great itching. It is usually not dangerous but can sometimes spread disease.
coral the hard skeleton of tiny sea animals called corals. Most kinds of corals live in warm tropical oceans, and their thousands of skeletons form reefs and atolls. [1/3 definitions]
coral reef a structure that rises up from the bottom of the sea and is made up of the hard skeletons of tiny sea animals called corals. Coral reefs are found in warm, shallow sea waters around the world. The largest system of coral reefs is found in the Coral Sea off the northeastern coast of Australia.
crumb a tiny piece that breaks or falls from baked goods.
cypress an evergreen tree that has tiny leaves like scales.
diminutive very small; tiny.
dust tiny, dry pieces of soil, dirt, or other material. [1/3 definitions]
fairy an imaginary tiny creature in human form, thought to have magic powers.
filter a device used to remove dirt or other solids from liquids or gases. A filter can be made of paper, charcoal, or other material with tiny holes in it. [1/5 definitions]
flax a plant with tiny blue flowers and with seeds from which an oil is pressed. [1/2 definitions]
flea a tiny insect that does not have wings but can jump far. Fleas feed on the blood of the animals they bite.
foam a lightweight, man-made material with many tiny air holes, used especially for packaging or for keeping things at a preferred temperature. [1/6 definitions]