Sci-Tech Encyclopedia
McGraw-Hill Encyclopedia of Science and Technology, 5th edition, published by The McGraw-Hill Companies, Inc.
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Hyeniales (paleobotany)
Hygrometer (instrument, measure)
Hymenostomatida (protozoa)
Hyperbola (in geometry)
Hypermastigida (protozoa)
Hypernuclei (nuclear physics)
Hyperon (in chemistry)
Hypersensitivity (in psychology, medicine)
Hypersonic flight (aeronautical engineering)
Hypertension (disease)
Hypervalent compounds (organic chemistry)
Hypnales (bryophyta)
Hypotrichida (protozoa)
Hysteresis (in physics)
Hysteresis motor (electrical engineering)
Hysteriales (lichens)
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