solstice
‘longitude between Earth’s equator and radius’
Lexical development traced from the Tamil root:
E. solsticke, solstist < O.F. solstice < Lat. solstitium ‘point at which the sun seems to stand still’ < sol ‘the sun’ + sistere ‘stand still, take a stand; to set, place, cause to stand’ < sawl < sawel- < Tamil el