| 1. | unduly demonstrative; lacking reserve: effusive greetings; an effusive person. |
| 2. | pouring out; overflowing. |
| 3. | Geology. extrusive (def. 3). |
| 1. | tending to extrude. |
| 2. | pertaining to extrusion. |
| 3. | Also, effusive. Geology. noting or pertaining to a class of igneous rocks that have been forced out in a molten or plastic condition upon the surface of the earth. |