| 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. |
| app |
An app is a computer application designed for use on a mobile device such as a cell phone. |
| 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. |
| 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. |
| cell |
A cell is a very small room that someone stays in or lives inside. Prisoners in jails live in cells. Very religious people who live in a community by themselves usually have cells too, but they use them mostly for sleeping and praying. [1/2 definitions] |
| 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. |
| cellular phone |
a telephone that can be taken anywhere and does not use wires. A cellular phone uses radio signals that are sent out from many different points called "cells." A cellular phone gets its signals from whatever cell is closest to it at the moment. A cellular phone is often called a "cell phone." |
| chirp |
When a small bird or an insect chirps, it makes a very short, high-pitched sound. Chirping is a way that these animals communicate with each other. Sometimes we say that a cell phone "chirps" when it makes a sound similar to this. |
| corpuscle |
a cell that moves freely in the blood. Red and white blood cells are corpuscles. |
| custody |
kept in a cell by the police. [1/2 definitions] |
| 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] |
| electronic |
If a device or piece of equipment is electronic, it uses electricity in a complex way using very tiny parts. Computers, cell phones, and digital cameras are electronic devices. |
| fertilize |
When an egg from a female animal is fertilized, it receives a special kind of cell from a male animal of the same type, which allows it to become a new animal, such as a baby fish, frog, or bird. [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] |
| message |
to send a message to (someone), especially using a cell phone or computer. [1/4 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] |