'dissipator' originates from Latin, specifically from the verb 'dissipare' meaning 'to scatter' combined with the agent‑forming suffix '-ator' (used to form nouns meaning 'one who does X'). In that Latin verb 'dis-' meant 'apart' and the root related to 'spargere' (to scatter).

'dissipator' developed from Late Latin/Medieval Latin formations based on 'dissipare' and the agent suffix '-ator'; the English term formed from the verb 'dissipate' + '-or' in post‑Medieval usage, with occasional technical uses appearing later in scientific and engineering contexts.

Initially connected with the idea 'to scatter or squander' (a person or action that scatters or wastes), the word's use has extended into technical contexts to mean 'a device or element that disperses energy (especially heat)'; the core idea of 'causing dispersion or loss' remains.