Thematic index of Biological classes
| -acea | Groups of animals. |
| -aceae | Families of seed-bearing plants. |
| -ales | Orders of plants. |
| -bacter | A genus of bacteria. |
| cet(o)- | A whale. |
| clad(o)- | A branch or branching. |
| -coccus | A spherical bacterium. |
| dino- | Terrible, frightful; dinosaur. |
| -ella | Genera of bacteria and algae. |
| -fera | Animal orders or phyla. |
| -florous | Having flowers of a certain type. |
| -formes | Orders of animals. |
| -ida | Taxonomic groups. |
| -idae | Taxonomic groups. |
| -ides | Plant and animal genera. |
| -ina | Forming nouns. |
| -inae | Animal subfamilies. |
| -lecithal | Having an egg yolk of a given kind. |
| lecith(o)- | Egg yolk. |
| lepid(o)- | Scales. |
| lys(o)- | Disintegration of cells. |
| -monas | Simple microorganisms. |
| -morpha | Animal groupings. |
| -myces | Bacteria or fungi. |
| -ont | An individual or cell of a specified type. |
| -pithecus | Genera of fossil apes. |
| -ptera | Winged animals. |
| sterco(r)- | Faeces; dung. |
| taxo- | Order, arrangement, classification. |
| -therium | An animal genus. |
| -zoon | Types of animal. |
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