Receptacle: In flowers and fruits, tissue to which all the floral whorls are attached.*
A strawberry is not a berry at all. It is actually a swollen receptacle. Each of the ‘seeds’ embedded in the surface of the juicy receptacle is an individual dry fruit called an achene.
*Pell, S.K., Angell, B. (2016). A botanist’s vocabulary: 1300 terms explained and illustrated. Portland: Timber Press.