What is the meaning of pike?

noun

• A broad highway designed for high-speed traffic.
  • synonyms: expressway, freeway, motorway, state highway, superhighway, throughway, thruway
• Highly valued northern freshwater fish with lean flesh.
• A sharp point (as on the end of a spear. )
• Medieval weapon consisting of a spearhead attached to a long pole or pikestaff; superseded by the bayonet.
• Any of several elongate long-snouted freshwater game and food fishes widely distributed in cooler parts of the northern hemisphere. .