n. [ NL. So named from Philippe Plantamour, of Geneva, Switzerland. ] (Chem.) A rare and doubtful metallic element said to have been discovered in the mineral samarskite. [ 1913 Webster ]
(n) a naval battle in World War II (1944); a decisive naval victory for the United States fleet over the Japanese who were trying to block supplies from reaching American troops on Leyte, Syn. battle of the Philippine Sea