The depression around the stem of a fruit is technically called the cavity.

Acuminate cavity. A cavity in which the stem meets the side of the cavity in a sharp, narrow angle.

Fig. 41. A, obtuse cavity; B, acuminate cavity; C, acute cavity.

Acute cavity. A cavity intermediate between an acuminate and an obtuse cavitv, as in the Canada Red apple. Obtuse cavity. A cavity in which the angle between the stem and the side is wide and blunt, as in the Rome Beauty apple.

In addition to the above we speak of the cavity as being wide or narrow, and deep, medium, or shallow.