A scientific dictionary is a niche product. Scientists use it.

There are many different categories, or types, of these dictionaries. They cover all the sciences from biology, chemistry, to physics and in others. This article delves into some of them.

There's a good scientific dictionary on the Internet. Kimball's Biology Pages is the name. It organizes information both alphabetically and via a search. Each letter of the alphabet links to an index of topics. Here's one.

The scientific dictionary has zygotene under the letter z. It's when cells separate into chromosomes. This only happens in some cells. The cell must be encased within a membrane.

Chimera is also found in this scientific dictionary. Genetic mosaic is another name for it. It's when two early embryos combine into one. It happens within the human species too. It's named for a Greek monster that had parts from various animals.

The scientific dictionary chimera is not the chimera of mythology. It lived in Lycia which is in Asia minor. It was featured in the Iliad. This creature could also breathe fire. It was sometimes described as having heads from a lion, goat and serpent.

The scientific dictionary doesn't mention the chimera's brother creature. This is the famous Hydra. This creature had more than one head. Hercules battled one. Two heads grew in place of any one that was lost. It was a difficult fight.

A scientific dictionary might also teach math to kids. One of these, online, has Flash animations. It's full of information. It covers the acute angle. That's an angle less than 90°. This is illustrated by a pelican who opens its beak to the angle entered on the page – the angle must be acute.

This math scientific dictionary for kids also demonstrates area. This is the size a surface occupies. Kids drag shapes to a grid, then count the squares occupied by the shape. It also shows different units both standard and metric.

The universe is wide open. Chances are if you're a scientist, or interested in science, you will find use in a scientific dictionary.