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:
Dictionary entry overview: What does rap mean? â¢ RAP (noun) The noun RAP has 6 senses: 1. a reproach for some lapse or misdeed 2. a gentle blow 3. the sound made by a gentle blow 4. voluble conversation 5. genre of African-American music of the 1980s and 1990s in which rhyming lyrics are chanted to a musical accompaniment; several forms of rap have emerged 6. the act of hitting vigorously Familiarity information: RAP used as a noun is common. â¢ RAP (verb) The verb RAP has 4 senses: 1. strike sharply 2. make light, repeated taps on a surface 3. perform rap music 4. talk volubly