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- Reduced pressure (19:05, 20 February 2006)
- Redox titration (19:07, 20 February 2006)
- Redox potential (19:07, 20 February 2006)
- Redox indicator (19:08, 20 February 2006)
- Red precipitate (19:09, 20 February 2006)
- Red phosphorus (19:11, 20 February 2006)
- Red nucleus (19:15, 20 February 2006)
- Red lead (19:16, 20 February 2006)
- Red heat (19:18, 20 February 2006)
- Recurring decimal (19:32, 20 February 2006)
- Recurrent fever (19:34, 20 February 2006)
- Rectum (19:36, 20 February 2006)
- Rectifier (19:37, 20 February 2006)
- Rectification (19:37, 20 February 2006)
- Recrystallization (19:38, 20 February 2006)
- Recovery (19:46, 20 February 2006)
- Recording hygrometer (19:48, 20 February 2006)
- Recorder (19:49, 20 February 2006)
- Recombination (19:51, 20 February 2006)
- Recoil nucleus (20:15, 20 February 2006)
- Recoil (20:17, 20 February 2006)
- Reclaimed rubber (20:18, 20 February 2006)
- Reciprocity law (20:18, 20 February 2006)
- Recessive mutation (20:19, 20 February 2006)
- Reamer (20:22, 20 February 2006)
- Quarantine (22:39, 20 February 2006)
- Quinidine (22:41, 20 February 2006)
- Quinine (22:42, 20 February 2006)
- Quintuplet (22:44, 20 February 2006)
- 친자확인 (22:51, 20 February 2006)
- Pyelogram (22:55, 20 February 2006)
- Pyelonephritis (22:58, 20 February 2006)
- Pyeloplasty (22:59, 20 February 2006)
- Pygomelus (23:01, 20 February 2006)
- Pyknosis (23:03, 20 February 2006)
- Pyloric stenosis (23:05, 20 February 2006)
- Pyloromyotomy (23:06, 20 February 2006)
- Pyloroplasty (23:07, 20 February 2006)
- Pylorospasm (23:08, 20 February 2006)
- Pylorostomy (23:10, 20 February 2006)
- Pylorotomy (23:11, 20 February 2006)
- Pylorus (23:12, 20 February 2006)
- Pyocele (23:13, 20 February 2006)
- Pyoderma (23:14, 20 February 2006)
- Pyogenic granuloma (23:16, 20 February 2006)
- Pyohemothorax (23:17, 20 February 2006)
- Pyorrhea (23:18, 20 February 2006)
- Pyospermia (23:19, 20 February 2006)
- Pyothorax (23:20, 20 February 2006)
- Pyramid (23:21, 20 February 2006)