spec. In reference to a classification of things (e.g. minerals, plants, animals, etc.).

Of legitimate birth (now rare); (also) truly or genuinely so by birth. Also in extended use: real, genuine; worthy of its origin.

Of or characteristic of good breeding or upbringing; refined, genteel. Also (usually with negative connotations): confirmed, deep-rooted, inveterate…

Pertaining to the original stock, pure-bred.

Of unmixed origin or descent, pure-blooded; genuine; unadulterated. Also as postmodifier.

true to form (also type): (of a plant or animal) typical of a particular breed or variety; (also) in a manner that is consistent with the type or…