Hiccough. A convulsive motion of some of the muscles used in breathing, accompanied by a shutting of the glottis.
Hilum, sometimes written Hilus. A small fissure, notch, or depression. A term applied to the concave part of the kidney.
Homogeneous (Gr. ὁμός, the same, and γένος, kind). Of the same kind or quality throughout; uniform in nature,—the reverse of heterogeneous.
Humor. The transparent contents of the eyeball.
Hyaline (Gr. ὕαλος, glass). Glass-like, resembling glass in transparency.
Hydrogen. An elementary gaseous substance, which, in combination with oxygen, produces water.
Hydrophobia (Gr. ὕδωρ, water, and φοβέομαι, to fear). A disease caused by the bite of a rabid dog or other animal.
Hygiene (Gr. ὑγἰεια health). The art of preserving health and preventing disease.
Hyoid (Gr. letter υ, and εἰδος, form, resemblance). The bone at the root of the tongue, shaped like the Greek letter υ.
Hypermetropia (Gr. ὑπέρ over, beyond, μέτρον, measure, and ώ̓ψ, the eye). Far-sightedness.