Rudimentary vs. Rudimental — Which is Correct Spelling?

Of or relating to basic facts or principles; elementary

Being in an early stage of development or having a simple form

(Biology) Imperfectly or incompletely developed

Of or relating to one or more rudiments.

Basic; minimal; with less than, or only the minimum, necessary.

One of the rudimentary mammae of boars.

Of or pertaining to rudiments; consisting in first principles; elementary; initial; as, rudimental essays.

Very imperfectly developed; in an early stage of development; embryonic.

Being or involving basic facts or principles;

Being in the earliest stages of development;

Not fully developed in mature animals;