Definition of PLACOID. : of, relating to, or being a scale of dermal origin with an enamel-tipped spine characteristic of the elasmobranchs. ADVERTISEMENT.Greek plak-, plax flat surface.First Known Use: 1842.efinition of PLACOID. : of, relating to, or being a scale of dermal origin with an enamel-tipped spine characteristic of the elasmobranchs. ADVERTISEMENT. Greek plak-, plax flat surface. First Known Use: 1842.
A tree pruner is a class 1 lever. The fulcrum is where the two blades cross, and the load is what you are cutting. The effort is applied to the two handles.
Pines are conifers with NEEDLES attached in a BUNDLE. The bundle or sheath that holds the needles together is called a fascicle. The genus Pinus all produce fruits called CONES. There are three species of pine trees native to the U.P., white pine, red pine, and jack pine.There have been a number of introduced pines.he bundle or sheath that holds the needles together is called a fascicle. The genus Pinus all produce fruits called CONES. There are three species of pine trees native to the U.P., white pine, red pine, and jack pine.