| Tovell, Ralph | <person> U.S. Anaesthesiologist, 1901-1967. See: Tovell tube. (05 Mar 2000) |
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| Tovell tube | An armored tracheal tube with a wire spiral embedded in the wall to prevent obstruction of the lumen when the tube is compressed and kinking when the tube is bent at a sharp angle. (05 Mar 2000) |
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| Reitan, Ralph | <person> U.S. Psychologist, *1922. See: Halstead-Reitan battery. (05 Mar 2000) |
| Reye, Ralph Douglas Kenneth | <person> 20th century Australian pathologist. See: Reye's syndrome. (05 Mar 2000) |
| Grover, Ralph | <person> U.S. Dermatologist, *1920. See: Grover's disease. (05 Mar 2000) |
| Liesegang, Ralph | <person> German chemist, 1869-1947. See: Liesegang rings. (05 Mar 2000) |
| Lillie, Ralph | <person> U.S. Pathologist, 1896-1979. See: Glenner-Lillie stain for pituitary. See entries under stain. (05 Mar 2000) |