külmasid
Could you clarify what you mean by "külmasid"? It does not appear as a widely recognized term, so I want to ensure I write the article in the intended sense. Do you mean:
- a meteorological concept (for example a term related to frost days or cold spells in Estonia)?
- a place name, organization, or cultural term?
- a fictional or literary concept?
If you provide the context or the specific sense you want, I can produce a concise, neutral