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1. often rudiments
a. A fundamental element, principle, or skill, as of a field of learning: the rudiments of calculus.
b. Something in an incipient or undeveloped form: the rudiments of social behavior in children; the rudiments of a plan of action.
2. Biology An imperfectly or incompletely developed organ or part.

[Latin rudīmentum, from rudis, rough, unformed.]

ru′di·men′tal (-mĕn′tl) adj.
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Of or treating the most basic aspects:
References in classic literature ?
If you attentively regard almost any quadruped's spine, you will be struck with the resemblance of its vertebrae to a strung necklace of dwarfed skulls, all bearing rudimental resemblance to the skull proper.
In the midst of this sterility, the rudimental carcass of the Globe appeared in ridges of sharply-jutting rock.
They seemed to me to be rudimental, burrowing men, still standing on their defence, awaiting their transformation.
Two or three times, even, to the great astonishment of his friends, he had, when Aramis allowed some rudimental error to escape him, replaced a verb in its right tense and a noun in its case.
DJ Sigala will be the main event on Saturday night with group Rudimental taking centre stage on Sunday.
In the singles chart, rap superstar Drake is facing competition from London band Rudimental, whose new single These Days is challenging for the top spot.
If you're planning to go to work on Tuesday, you may want to think again because the performance by the British band Rudimental on Monday is sure to keep you up way past your bedtime.
Way is coming to the UAE, and the first acts announced are headliners Rudimental and Disclosure.
Rudimental After scoring their second number one album, We The Generation, to widespread critical acclaim, Rudimental take it on tour.
Dance act Rudimental joined him for one of his rare performances with a band.