Part of speech: Noun
the elementary stages of any subject (usually plural)
Example: he mastered only the rudiments of geometry
Categories: Fundamentals, Basics, Fundamental principle, Basic principle, Bedrock
Part of speech: Noun
the remains of a body part that was functional at an earlier stage of life
Example: Meckel's diverticulum is the rudiment of the embryonic yolk sac
Categories: Body part
The word "rudiment" comes from Latin rudimentum.
rude – A related word in the same word family.
Many Latin words entered English twice—once through French and once through direct borrowing.