— trachytic /treuh kit"ik/ , trachytoid /trak"i toyd', tray"ki-/ , adj.
/tray"kuyt, trak"uyt/ , n.
a fine-grained volcanic rock consisting essentially of alkali feldspar and one or more subordinate minerals, as hornblende or mica: the extrusive equivalent of syenite.
[ 1815-25; trachýtes roughness, equiv. to trachý ( s ) rough + - tes n. suffix ]