glutamate: a salt or ester of glutamic acid
salt: a compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal)
belemnite: a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing (when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family Belemnitidae