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From Biology-Online Dictionary
(Science: physiology) a modified respiratory movement; a spasmodic inspiration, consisting of a sudden contraction of the diaphragm, accompanied with closure of the glottis, so that further entrance of air is prevented, while the impulse of the column of air entering and striking upon the closed glottis produces a sound, or hiccough.
alternative forms: hickup or hiccup.
Origin: oe. Hickup, hicket, hickock; prob. Of imitative origin; cf. D. & dan. Hik, Sw. Hicka, Armor. Hak, hik, W. Ig, f. Hoquet.