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.
March 5, 1770. The first person who was hit when the British soldiers began firing was an African American sailor named Crispus Attucks. Although not much is known about his past, it's likely that Attucks escaped slavery around 1750 and worked on whaling ships for the next 20 years. Of the five civilians who died in the Boston Massacre, Attucks is the only one who became widely known, and he became the first hero of the American Revolution.