solstice (n.) Look up solstice at Dictionary.com
mid-13c., from Old French solstice (13c.), from Latin solstitium "point at which the sun seems to stand still," especially the summer solstice, from sol "sun" (see Sol) + past participle stem of sistere "to come to a stop, make stand still" (see assist (v.)). In early use, Englished as sunstead (late Old English sunstede).