English

heatspike

heat + spike

A compound of heat + spike

Proto-Indo-European *keHy- ‘heat’

Proto-Germanic *haitį̄

Proto-West Germanic *haitī

Old English hǣtu

Middle English hete ‘heat’

English heat

Proto-Indo-European *spey- ‘to be pointed’

Proto-Germanic *spīkō ‘stick, splinter, point’

Old Norse spík ‘spike, sprig’

Middle English spike

English spike

Today it means

noun A spike in temperatures, resulting in unusual heat.

Language periods are conventional ranges, not dates for this word.

Etymograph / heatspike