[ 'ru:dɪm(ə)nt ]
■ noun
1》 ( ~s ) the first principles of a subject.
↘an elementary or primitive form of something.
2》 Biology an undeveloped or immature part or organ.
3》 Music a basic pattern used by drummers, such as the roll, the flam, and the paradiddle.
Origin
C16: from Fr., or from L. ~um , from rudis 'unwrought'.