|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.|
millisecond mil·li·sec·ond (mĭl'ĭ-sěk'ənd)
Abbr. ms, msec One thousandth (10-3) of a second.