| crena | A V-shaped cut or the space created by such a cut; one of the notches into which the opposing projections fit in the cranial sutures. Origin: L. A notch (05 Mar 2000) |
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| crena ani | The sulcus between the buttocks (nates). Synonym: crena ani, anal cleft, crena clunium, gluteal cleft. (05 Mar 2000) |
| crena clunium | The sulcus between the buttocks (nates). Synonym: crena ani, anal cleft, crena clunium, gluteal cleft. (05 Mar 2000) |
| crena cordis | A groove on the anterosuperior surface of the heart, marking the location of the septum between the two ventricles. Synonym: sulcus interventricularis anterior, crena cordis. (05 Mar 2000) |
| crenarchaeota | A kingdom in the domain archaea comprised of thermoacidophilic, sulfur-dependent organisms. The two orders are sulfolobales and thermoproteales. (12 Dec 1998) |
| crenate | With small, rounded teeth, scalloped. (09 Oct 1997) |
| crenation | <haematology> Distortion of the erythrocyte membrane giving a spiky, echinocyte, morphology. Results from ATP depletion or an excess of lipid species in the external lipid layer of the membrane. (18 Nov 1997) |