opening by a transverse line around the circumference
• (a.) Dehiscing or opening by a transverse fissure extending around (a capsule or pod). See Illust. of Pyxidium.
<plant biology> Opening splitting by a transverse fissure around the circumference, leaving an upper and lower half, said of certain seed pods or capsules. ... (15 Jan 1998) ... 
Describing a round fruit that dehisces horizontally so that the top portion comes off like a lid to release the seed or seeds.
Cir`cum·scis'sile adjective [ Prefix circum- + scissle .] (Botany) Dehiscing or opening by a transverse fissure extending around (a capsule or pod). See Illust. of Pyxidium . 
Opening or dehiscing by a line around the fruit or anther, the valve usually coming off as a lid.
opening along a transverse circular line, as a seed vessel.