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. Crispus Attucks (c.1723âMarch 5, 1770) was the first person killed in the Boston massacre, in Boston, Massachusetts,[2] and is widely considered to be the first American killed in the American Revolution.