[si-rak; Fr. sey-rak] 
[-raks; Fr. -rak] . | a large irregularity of glacial ice, as a pinnacle found in glacial crevasses and formed by melting or movement of the ice. |
| sé·rac also se·rac (sə-rāk', sā-) n. A large pointed mass of ice in a glacier isolated by intersecting crevasses. [French, cottage cheese, sérac, perhaps from Vulgar Latin *serāceum, whey, from Latin serum.] |