|part of speech:
||(usu. pl.) a basic element, idea, skill, or the like in a complex subject or activity.
The handyman knew only the rudiments of carpentry.
||(often pl.) something in an initial, imperfect, or undeveloped form.
The rudiments of civilization were evident in their society.
||an incompletely developed part of a living organism.
||basic, bottom, element, essence, essential, germ, principle, vestige