Words that start with I

An imp is a demon with the appearance of a child.

Something that is noticeably not perfect is described as imperfect.

An imposter is a person who pretends to be someone else in order to deceive others.

The word comes from Latin roots meaning to impose or deceive.

Something is in something else if it is contained in it somehow. The person in the picture is in a bath.
The opposite of in is out.

An inch is 1/12th of a foot, or 2.54 centimeters.

Your incisors are the teeth in the front of your mouth that you use for biting food.

Incisors have a sharp edge on top and are used to break off smaller bits of larger food items so you can fit them in your mouth to chew them.

An index is a list of important topics, usually found at the back of a book. It gives the location where each item appears, helping you find information quickly. An index is often arranged in alphabetical order and may include smaller topics under a main topic. It is different from a table of contents, which lists chapters in the order they appear. The word comes from a Latin word meaning "pointer" or "sign."

An index can also be a number or sign that shows the size or change of something, such as a price index.

The picture is of an old card index, where you can look up where things are in a library or collection of things.

Indigo is a purple-blue color that was originally made from the indigo plant.
Many types of jeans are dyed indigo.

Something is industrial if they are used for or by industry. This usually means heavy manufacturing or large scale production, like ore refining. Industrial objects are usually very big, heavy and dirty.
The opposite of industrial is domestic.

When a lot of something that you really don't want, comes to a place where you don't want them, they are infesting that place. You might have aphids infest your rose bushes.
Infestations usually take some effort to get rid of.