| Term | Definition |
| MUCRO (1) |
The posterior, pointed septum of caecid gastropods ( = APICAL PLUG). Photo: Meioceras cornucopiae |
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| MUCRO (2) | The high point on the eighth (VIII) VALVE of a CHITON shell. See illustration: Composite Chiton. | |
| MUCRONATE | Sharp; see also: MURICATED. | |