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vertical 1 today perpendicular to level ground; extending at right angles to the horizon; upright. [4 definitions] Main Adv.
Geiger counter 1 today an instrument that detects radiation by means of a gas that ionizes when in the presence of radioactive emanations, and that also measures it by a device that counts the electrical pulses emitted by the ionized gas. Main Adv.
skeleton 1 today the inner framework of bones and cartilage in vertebrate animals, which supports and protects the softer body parts, or the hard external shell of invertebrates and some vertebrates. [4 definitions] Main Adv.