| hecatomb | (noun) a great sacrifice; an ancient Greek or Roman sacrifice of 100 oxen | - |
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| heckelphone | (noun) an oboe pitched an octave below the ordinary oboe | Synonyms: basset oboe |
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| heckle | (noun) a comb for separating flax fibers | Synonyms: hatchel |
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| heckler | (noun) someone who tries to embarrass you with gibes and questions and objections | Synonyms: badgerer |
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| heckling | (noun) shouting to interrupt a speech with which you disagree | Synonyms: barracking |
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| hectare | (noun) (abbreviated `ha') a unit of surface area equal to 100 ares (or 10,000 square meters) | - |
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| hectogram | (noun) 100 grams | Synonyms: hg |
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| hectograph | (noun) duplicator consisting of a gelatin plate from which ink can be taken to make a copy | Synonyms: heliotype |
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| hectoliter | (noun) a metric unit of volume or capacity equal to 100 liters | Synonyms: hectolitre, hl |
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| hectolitre | (noun) a metric unit of volume or capacity equal to 100 liters | Synonyms: hectoliter, hl |
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| hectometer | (noun) a metric unit of length equal to 100 meters | Synonyms: hectometre, hm |
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| hectometre | (noun) a metric unit of length equal to 100 meters | Synonyms: hectometer, hm |
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