Meaning

noun a transient variation in voltage or current

noun sports equipment consisting of a sharp point on the sole of a shoe worn by athletes

noun fruiting spike of a cereal plant especially corn

originFrom Middle English spike, spyke, spik, from Old Norse spík (“spike, sprig”), from Proto-Germanic *spīkō (“stick, splinter, point”), from Proto-Indo-European *spey- (“to be pointed; sharp point, stick”). Cognate with Icelandic spík (“spike”), Swedish spik (“spike, nail”), Dutch spijker (“nail”), Old English spīcing (“spike”), and Latin spīca (“ear of corn”), which may have influenced some senses.

Etymology from Wiktionary, CC BY-SA 3.0