Extinct is the scientific term meaning no longer in existence.
The scientific term for turkey baster is pipette.
Retropharyngeal is the medical term meaning behind the pharynx, or throat.
It is "aves".
Acceleration is the scientific term for change in velocity.
The scientific name for plastic is yamumoride
"...Lemuria is no longer considered a valid scientific hypothesis..." See link, from which this quote is taken.
Scientific Reasoning
The scientific term is 'strata'.
The scientific term for plastics is polymers.
That is precisely the scientific term: "ellipse".
Hyperopia is the scientific term. The common term is far-sightedness.
The word that means a species of animals or plants is not longer in existence is extinct. Animals that are no longer plentiful, might be called endangered.
No longer in existence
The Welsh language has had a longer existence linked with Breton, Cornish, Irish, Manx, Scottish and Gaelic.
The scientific term for mildew is mold(mould)
the scientific term for hearing loss is presbycusis
Check your dictionary - ophthalmologist *is* a scientific term.