The story
According to the authors of its first attestation, from acro- + Ancient Greek πλατύς (platús, “flat”) + -some, but synonymous πλάξ (pláx) fits better.
Etymology from Wiktionary, CC BY-SA 4.0.
acroplaxome
Today it means: A structure that lies between the membranes of the acrosome and nucleus of a spermatozoon. Full definition →