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ichthyo- fish.
ichthyology the scientific study of fishes.
ichthyosaur any of an extinct variety of marine reptiles that had four flippers, a dolphinlike head, and a vertical caudal fin, and that ranged in length from four to forty feet.
ichthyosaurus an ichthyosaur.
-ician one who specializes in or practices.
icicle a tapered spike of ice formed by the freezing of dripping water.
icing a sweet glaze for coating or decorating baked goods, esp. cakes; frosting.
icon an image, representation, or symbol. [4 definitions]
icono- image; likeness.
iconoclast one who attacks and seeks to break down traditional beliefs and institutions or popular ideas and values. [2 definitions]
iconoclastic attacking or designed to attack established traditions, beliefs, or values, in order to break them down.
iconography the representation of meanings, esp. conventional ones, by visual symbols or images. [3 definitions]
iconology in art history, the study or interpretation of symbols or icons. [2 definitions]
icosahedron a solid geometric figure with twenty flat sides of equal area.
-ics the science, study, skill, or art of (such) a subject or activity. [3 definitions]
ictus a metrical or rhythmical stress, as in poetry. [2 definitions]
icy made of, covered with, containing, or resembling ice. [3 definitions]
-id1 belonging to a particular group or zoological family.
-id2 variant of -ide.
-id3 used in adjectives, esp. those describing conditions that affect the senses.
ID1 abbreviation of "Idaho," a northwestern U.S. state south and west of Montana.