Freebase(0.00 / 0 votes)Rate this definition: Hydraulic conductivity. Hydraulic conductivity, symbolically represented as, is a property of vascular plants, soil or rock, that describes the ease with which a fluid can move through pore spaces or fractures.
Crispus Attucks was an African-American man killed during the Boston Massacre, making him the first casualty of the American Revolution.
Crispus Attucks (circa 1723 - March 5, 1770), was one of five people killed in the Boston Massacre. He has been frequently named as the first martyr for the cause of American Independence and was the only person killed in the event whose name is commonly remembered.