Apoptosis

Definitions

(Noun) (biolog.) programmed cell death caused by inter- and extracellular signals

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derived from Apo asunder, away from and Ptosis closing down. The correct pronunciation is, therefore APO-PTOSIS. Most doctors even experts in this field incorrectly say "A-POPTOSIS" which is also wrong. Doctors are used to wards starting with "A-xxx", where the prefix "A" means lack of...
Such as A-tonic no muscle tone, a-rhythmia no normal rhythm etc.
A-poptosis would mean "No poptosis]. But there is no such thing as "Poptosis", so you cannot have a lack of it.