-oid, -oidal, -oidism, -odic

The rounded protrusion of bone just behind the ear.

The mastoid was once thought to look like a breast; hence its name.

Having a large allantois; an animal so characterized.

Resembling a megatherium.

Large animals.

Concavo-convex, like a meniscus.

The Mesozoic is divided into three time periods: the Triassic (245-208 Million Years Ago), the Jurassic (208-146 Million Years Ago), and the Cretaceous (146-65 Million Years Ago).

Mesozoic means "middle animals", and is the time during which the world fauna changed drastically from that which had been seen in the Paleozoic.

Dinosaurs, which are perhaps the most popular organisms of the Mesozoic, evolved in the Triassic, but were not very diverse until the Jurassic.

Except for birds, dinosaurs became extinct at the end of the Cretaceous period. Some of the last dinosaurs to have lived are found in the late Cretaceous deposits of Montana in the United States.

The Mesozoic was also a time of great change with terrestrial vegetation. The early Mesozoic was dominated by ferns, cycads, ginkgophytes, bennettitaleans, and other unusual plants.

Modern gymnosperms; such as, conifers, first appeared in their current recognizable forms in the early Triassic. By the middle of the Cretaceous period, the earliest angiosperms had appeared and began to diversify, largely taking over from the other plant groups.

1. A body moving through space, of the same nature as those which when passing through the atmosphere become visible as meteors.
2. One of the many small bodies in the solar system that become meteors on entering the earth’s atmosphere.

Having a small allantois; an animal so characterized.

1. A mucilaginous preparation.
2. A thick, sticky, glue-like preparation resembling mucilage.

Resembling mucin or mucus present in saliva and bile, in salivary glands, and in the skin, connective tissues, tendon, and cartilage.

1. Resembling, or like, mucus.
2. Similar to, or having the characteristics, of mucus.
3. Any of a group of glycoproteins, differing from true mucins in their solubilities and precipitation properties (insoluble solid substances that form from chemical reactions between solutions).