rudiment

• Terminology

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Noun

1. the remains of a body part that was functional at an earlier stage of life; “Meckel’s diverticulum is the rudiment of the embryonic yolk sac”
   • Less specific
     • body part
   • Related
     • vestigial
     • rudimentary
     • rudimentary

first principals of

rudiment - LookUp

noun

1. the rudiments of the first principles of (a subject)
   she taught the girls the rudiments of reading and writing

an elementary or primitive form of (something)
the rudiments of a hot-water system

2. Biology an undeveloped or immature part or organ, especially a structure in an embryo or larva which will develop into an organ, limb, etc.
   the fetal lung rudiment
   
3. Popular music a basic pattern used by drummers, such as the roll, the flam, and the paradiddle

Origin

mid 16th century : from French , or from Latin rudimentum , from rudis unwrought , on the pattern of elementum element

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