(zoology) The process of an organ being reduced to a rudimentary form. / (zoology) The rudimentary form that results from this process.

plural of rudimentation

(often in the plural) A fundamental principle or skill, especially in a field of learning. / (often in the plural) A form that lacks full or complex development.

(transitive) To ground; to settle in first principles.

plural of rudiment

(uncommon) Rudimentary.

simple past tense and past participle of rudiment

present participle of rudiment