What does SPIKE mean?

noun

1. a transient variation in voltage or current
2. sports equipment consisting of a sharp point on the sole of a shoe worn by athletes“spikes provide greater traction”
3. fruiting spike of a cereal plant especially corn
4. (botany) an indeterminate inflorescence bearing sessile flowers on an unbranched axis
5. a sharp rise followed by a sharp decline“the seismograph showed a sharp spike in response to the temblor”
6. a very high narrow heel on women's shoes
7. each of the sharp points on the soles of athletic shoes to prevent slipping (or the shoes themselves)“the second baseman sharpened his spikes before every game”
8. a sharp-pointed projection along the top of a fence or wall (or a dinosaur)