Merriam Webster: Dictionary Illustration: Forms of Leaf

Basic diagram of a solar eclipse illustrates the relative positions of the sun, moon, and earth.

Labeled illustration of three patterns of veins in leaves.

This is basic cloud chart illustrating shape and relative altitude of ten key cloud types. Scroll down to the bottom for the list of cloud types by name.

Basic diagram illustrating five main structures of a feather.

Labeled illustration of a cabbage butterfly.

Labeled illustration of a bacteriophage.

Labeled illustration of inflorescence, which refers to flowering or a flower cluster.

Labeled illustration of a neuron, with callouts for the nerve body, dendrites, axon, and endings.

Labeled illustration of the principal parts of the eye.

Labeled illustration of a plant and an animal cell and their parts.