|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
spermatogonium sper·mat·o·go·ni·um (spər-māt'ə-gō'nē-əm, spûr'mə-tə-)
n. pl. sper·mat·o·go·ni·a (-nē-ə)
Any of the cells of the gonads in male organisms that are the progenitors of spermatocytes. Also called spermatoblast.