the.com/freezing point

means The specific temperature at which a liquid turns solid under given conditions — for water, famously 0°C or 32°F.

from A straightforward compound of 'freeze' (from Old English 'freosan,' tracing back to a Proto-Indo-European root meaning to freeze or burn with cold — the same root oddly linked to 'frost') plus 'point' in its sense of a precise, measurable mark on a scale. The term itself emerged alongside the development of thermometry and standardized temperature scales, when scientists needed exact, repeatable markers — freezing and boiling points of water became the fixed pegs on which whole measurement systems were hung.