| Huygens' ocular | The compound ocular of a microscope, composed of two planoconvex lenses so arranged that the plane side of each is directed toward the observer. (05 Mar 2000) |
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| Huygens' principle | Used in ultrasound technology; the principle that any wave phenomenon can be analyzed as the sum of many simple sources properly chosen with regard to phase and amplitude. (05 Mar 2000) |
| Huygens, Christian | <person> Dutch physicist, 1629-1695. See: Huygens' ocular, Huygens' principle. (05 Mar 2000) |