(ˈ)sälz|tishəl, (ˈ)sōl-, (ˈ)sȯl-, -l|st- adjective
Etymology: Latin solstitialis, from solstitium solstice + -alis -al
: of, relating to, or characteristic of a solstice and especially the summer solstice : happening or appearing at a solstice or being associated with a solstice