lignum vitae: small evergreen tree of Caribbean and southern Central America to northern South America; a source of lignum vitae wood, hardest of commercial timbers, and a medicinal resin
angiospermous tree: any tree having seeds and ovules contained in the ovary
alkaline earth: any of the bivalent metals of group II of the periodic table (calcium or strontium or barium or magnesium or beryllium)