What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
Of, relating to, or designating hexactinellid sponges of the suborder Dictyonina, which have a siliceous skeleton formed from fused spicules. Formerly also: = dictyonal.
A dictyonine sponge.
Late 19th century. From ancient Greek δίκτυον net + -ine, after scientific Latin Dictyonina, suborder name.