solstizio
solstice
noun sol-STEE-tsyoh Rare
Origin: Latin solstitium, from sol (sun) + sistere (to stand still).
Usage Note
Solstizio refers to either the summer solstice (solstizio d'estate, around 21 June) or the winter solstice (solstizio d'inverno, around 21 December). The plural is solstizi. Do not confuse with equinozio (equinox), which marks equal day and night rather than the longest or shortest day.
Examples
"Il solstizio d'estate è il giorno più lungo dell'anno."
Natural Translation
The summer solstice is the longest day of the year.

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