1. Objects from real life or from the real world, as opposed to theoretical constructs or fabricated examples, esp. when used as teaching aids

Encyclopedia: Realia

• Wyoming
• Wyomingite
• Wyrd
• WYSIWYG
• Wystan Hugh Auden
• Wyszynski
• Wytensin
• wyvern
• x
• X chromosome
• X factor
• x-axis
• X-linked
• X-linked dominant inheritance
• X-linked gene
• X-linked recessive inheritance
• X-linked SCID
• X-OR circuit
• X-radiation
• X-rated
• x-ray
• X-ray astronomy
• X-ray crystallography
• X-ray diffraction
• X-ray film