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1540s, from Middle French rudiment (16c.) or directly from Latin rudimentum "early training, first experience, beginning, first principle," from rudis "unlearned, untrained" (see rude). Related: Rudiments.
rudiment ru·di·ment (rōō'də-mənt)
An imperfectly or incompletely developed organ or part.
Something in an incipient or undeveloped form. Often used in the plural.