pləˈtizmə noun
( plural pla·tys·ma·ta -məd.ə ; also platysmas )
Etymology: New Latin, from Greek platysma flat piece, plate, from platynein to widen, flatten — more at platynite
: a broad thin layer of muscle on each side of the neck immediately under the superficial fascia that belongs to the group of facial muscles and is innervated by the facial nerve
• pla·tys·mal -zməl adjective