| 1. | Biology. breaking up into fragments or separate portions; dividing into parts. |
| 2. | pertaining to an anatomical model made up of detachable pieces. |
| 3. | Geology. noting or pertaining to rock or rocks composed of fragments or particles of older rocks or previously existing solid matter; fragmental. |

clastic clas·tic (klās'tĭk)
adj.
Breaking up into pieces or exhibiting a tendency to break or divide.
Separable into parts or having removable sections, as an anatomical model.
| clast (klāst) Pronunciation Key
A rock fragment or grain resulting from the breakdown of larger rocks. clastic adjective (klās'tĭk) |