| 1. | a legendary animal combining features of animal and human form or having the forms of various animals in combination, as a centaur, griffin, or sphinx. |
| 2. | any creature so ugly or monstrous as to frighten people. |
| 3. | any animal or human grotesquely deviating from the normal shape, behavior, or character. |
| 4. | a person who excites horror by wickedness, cruelty, etc. |
| 5. | any animal or thing huge in size. |
| 6. | Biology.
|
| 7. | anything unnatural or monstrous. |
| 8. | huge; enormous; monstrous: a monster tree. |

monster mon·ster (mŏn'stər)
n.
An animal, a plant, or other organism having structural defects or deformities.
A fetus or an infant that is grotesquely abnormal and usually not viable.