The Spanish verb 'helar' meaning 'to freeze' comes directly from the Latin verb 'gelare', which also meant 'to freeze'. During the evolution from Latin to Spanish, the initial 'g' sound softened to 'h', a common sound change in Spanish phonological development. This is similar to how many Spanish words that begin with 'h' correspond to Latin words that began with 'f' or 'g'.

Some related Spanish words include 'hielo' (ice), 'helado' (ice cream or frozen), and 'helada' (frost). All these words share the same Latin root and form a family of words related to freezing and coldness.

English speakers might recognize this root in words like 'gelatin' and 'gel', which come from the same Latin root 'gelare'. Gelatin is a substance that becomes firm or jelly-like when cold, directly relating to the freezing meaning of the original Latin word. The word 'congeal' is another English relative, meaning 'to freeze or become solid'.