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 (. 1723âMarch 5, 1770) may have been a Native American slave or freeman, merchant seaman and dockworker of Wampanoag and African descent. His father was an African-born slave and his mother a Native American. He was the first casualty of the Boston massacre, in Boston, Massachusetts, and is widely considered to be the first American casualty in the American Revolutionary War.