Pentagon
01
五角形, 五辺形
a geometric shape with five angles and five straight sides
例
She drew a pentagon on the chalkboard to illustrate its shape to the students.
彼女は生徒たちにその形を説明するために黒板に五角形を描いた。
02
a five-sided U.S. government building that houses the Department of Defense
03
the U.S. military establishment as an institution
