Final answer:
A definition of 'dog' that refers to 'tamed lupus canis' is imprecise, while a definition of a 'unicorn' refers to a mythical, not biological, entity. Definitions must align with established scientific nomenclature and evidence to be deemed accurate.
Step-by-step explanation:
Definitions can be considered accurate or conversely inaccurate based on their alignment with the object or concept they are meant to describe. A definition like "Dog (noun): A tamed lupus canis" is somewhat imprecise, as it omits the recognized scientific name for domestic dogs, Canis lupus familiaris, and does not encapsulate the full heritage and characteristics of the subspecies. Dogs have originated from different wolf subspecies through selective breeding, resulting in phenotypic differences despite being able to interbreed and produce viable offspring.
On the other hand, the definition of a unicorn as "A horse with a horn growing out of its forehead; may be of any color, but are usually pink or white" refers to a mythical creature that, unlike dogs, does not have a basis in biological reality. Therefore, while the term pink unicorn may reflect popular imagery or mythology, it cannot be considered true in a biological sense as there is no scientific evidence for their existence, akin to resonance forms in chemistry that are convenient imaginary constructs.