| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
somatopleure so·mat·o·pleure (sō-māt'ə-pl&oobreve;r', sō'mə-tə-)
n.
A complex sheet of embryonic cells formed by association of part of the mesoderm with the ectoderm and developing as the internal body wall.