Xiphosura. Order of Arachnida, all extent except Limulus Marine. Appeared in Ordovician. Board prosoma to which is hinged the abdomen, bearing a terminal spike
Xerosere. A plant succession that begins on a dry site.
X-rays. Electromagnetic radiation of shorter wavelength that ultraviolet radiation and longer wavelength than gamma radiation. The range of wavelength 10-11 m to 10-9 m X-rays can pass through many forms of matter and they are therefore used medically and industrially to examine internal structures. X-rays produced for these purposes by an X-ray tube.
Xylose. A pentose sugar that is present in plant cell walls formula C5H10O5.
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