| ECG | Electro-Cardio-Graphy(-Gram); 심전도 = EKG 1. Conducting System Structu... |
|---|---|
| HF | Hageman factor; haplotype frequency; hard filled [capsule]; hay fever; head of fetus; head forward; ... |
| recon | the smallest unit of DNA capable of recombination [recombination + Gr. on quantum] |
| HFR | high-frequency recombination |
| HFO | high-frequency oscillator; high-frequency oscillatory [ventilation] |