(organic chemistry) The polycyclic aldehyde (1S,3R,4R,8S,11S,12R)-4,8,12,15,15-pentamethyl-7-oxotricyclo[9.3.1.0^(3,8)]pentadecane-6-carbaldehyde

In terms of taxons.

(taxonomy) A group of one or more populations of an organism or organisms seen by taxonomists to form a unit.

The state of being taxonic.

Relating to taxons.

plural of taxonicity

(proscribed) plural of taxon

(informal) A taxon that exists only to classify organisms that do not fit anywhere else, being either paraphyletic or polyphyletic and therefore not considered valid under modern rules of taxonomy.

(paleontology) A taxon that falsely appears to persist until, or reappear at, a time in the fossil record later than the taxon's actual point of extinction, due to fossils of organisms belonging to the taxon having been eroded from their original strata and redeposited in the source sediments for younger strata.

(paleontology) A taxon that has been misidentified as having re-emerged in the fossil record after a period of presumed extinction, but is not actually a descendant of the original taxon, instead having developed a similar morphology through convergent evolution.