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Holly (plant)
Holmium (element, metal)
Holocene (geologic time)
Holography (in photography)
Holothuroidea (echinoderm)
Homalozoa (echinodermata)
Homing (military)
Hookeriales (bryophyta)
Hoplocarida (arthropoda)
Hoplonemertini (rhynchocoela)
Horizon (in astronomy)
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Hormone (material)
Hornbeam (tree)
Horology (in science)
Horseradish (plant, herb)
Horst (geology and geodesy)
Horticultural crops (field crops, grasses, plant fibers, spices, tree crops, herbs)
Hospital infections (medical bacteriology, mycology, parasitology)
Hot spots (geology)
Hot-water heating system (mechanical engineering)
Huebnerite (mineralogy and petrology)
Human Genome Project (in genetics)
Human variation (anthropology)
Human-computer interaction (computing)
Human-factors engineering (design engineering)
Humidistat (mechanical engineering)
Humidity (in meteorology)
Humidity control (mechanical engineering)
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