| C1a | activated first component of complement |
|---|---|
| C1 INH | inhibitor of first component of complement |
| D1 | diagonal one; first dorsal vertebra |
| F1, | F2 etc. first, second, etc., filial generation |
| FA | false aneurysm; Families Anonymous; Fanconi anemia; far advanced; fatty acid; febrile antigen; femor... |