| FCS | faciocutaneoskeletal syndrome; fecal containment system; feedback control system; fetal calf serum; ... |
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| FD | familial dysautonomia; family doctor; fan douche; fatal dose; fetal danger; fibrin derivative; fibro... |
| FDIU | fetal death in utero |
| FDZ | fetal danger zone |
| FEBP | fetal estrogen-binding protein |
| lumbar triangle | An area in the posterior abdominal wall bounded by the edges of the latissimus dorsi and external oblique muscles and the iliac crest; herniations occasionally occur here. Synonym: trigonum lumbale, Petit's lumbar triangle. (05 Mar 2000) |
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| lumbocostoabdominal triangle | An irregular area bounded by the serratus posterior inferior, obliquus externus, obliquus internus, and erector spinae muscles. (05 Mar 2000) |