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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.
bacteria microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. Bacteria are each made up of only one cell, but different kinds of bacteria can take different shapes. These organisms live in all parts of the earth including oceans, deserts, glaciers, hot springs, and in the bodies of most living things. While some kinds of bacteria are dangerous, most kinds are useful because they help in the digestion of food, in the making of soil, in the creation of medicines, and in many other natural processes.
cell phone a telephone that operates using radio signals and therefore requires no wires. A cell phone can be taken with one anywhere but may not function if it is too far away from a radio transmitter to receive signals.
corpuscle a cell that moves freely in the blood. Red and white blood cells are corpuscles.
cytoplasm the thick liquid substance that holds all the parts that are inside a cell.
dry cell an electric battery cell in which the chemicals are stored as a paste that will not spill.
egg1 a cell in a female animal or in some kinds of plants that can develop into a new individual after it is fertilized. [1/2 definitions]
honeycomb a group of many small cells made of wax in which bees store their honey. Each cell has thin walls and six sides. [1/3 definitions]
mobile a telephone that operates using radio signals and therefore requires no wires. A mobile can be taken with one anywhere but may not function if it is too far away from a radio transmitter to receive signals. Mobile has the same meaning as cell phone. [1/3 definitions]
nervous system the system of nerves and nerve centers in most animals with more than one cell.
nuclear of, or having to do with, or being the nucleus of an atom or a cell. [1/3 definitions]
nucleus the part of a cell that contains chromosomes, which control growth and reproduction in most living things. [1/3 definitions]
paramecium a living thing made of one cell that lives in fresh water. Paramecia can only be seen through a microscope. Paramecia are protozoans, tiny organisms that are similar to animals.
protozoan a tiny living thing that is similar to an animal but has only one cell or lives as a colony of single cells. Protozoans include amoebas and paramecia.
red blood cell a cell in the blood that carries oxygen to the body's tissues.
sperm1 a cell made by male animals. These cells fertilize the eggs made by a female, so that the animal can reproduce.
T cell a type of white blood cell that defends the body against certain diseases.
white blood cell a small blood cell with no color that helps protect the body against infections and bacteria.