The fronds of tree ferns are usually very large and multiple-pinnated, but at least one type has entire (undivided) fronds. The fronds of tree ferns also exhibit circinate vernation, meaning the young fronds emerge in coils that uncurl as they grow.he order Cyatheales, which includes the tree ferns, is a taxonomic division of the fern class, Polypodiopsida.
rap noun (MUSIC) A2 [ U ] a type of popular music with a strong rhythm in which the words are spoken, not sung:
History of Rap â The True Origins of Rap Music September 23, 2014 By cole mize 189 Comments Rap music is undeniably one of the most popular music genres to date but how well do you know the history of rap? Join me as I take a stroll down memory lane and revisit the origins of what we know today as Hip-Hop. Rap is actually a very old word. You can find the term popping up as early as the 15th and 16th century in Britain. Initially the word rap meant to strike or to hit. A few centuries later a slight variation of this definition appeared which meant to speak or talk.