Spider - Description. 1  1: pedipalp 2: trichobothria 3: carapace of prosoma (cephalothorax) 2  15: sternum of prosoma 16: pedicel (also called pedicle) 3  Spiders are chelicerates and therefore arthropods. 4  Spiders and scorpions are members of one chelicerate group, the arachnids.
See also: Meteoroid and Meteor. A meteorite is a solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the Earth's atmosphere and impact with the Earth's surface.
Definition of meteor. 1  1 : an atmospheric phenomenon (as lightning or a snowfall) 2  2a : any of the small particles of matter in the solar system that are directly observable only by their incandescence from frictional heating on entry into the atmosphereb : the streak of light produced by the passage of a meteor.