• (a.) Having the axis of the seed perpendicular to the axis of the pericarp to which it is attached. • (a.) Rotatory; circuitous.
Per·it'ro·pal adjective [ Greek ..., from ... to turn around; ... around + ... to turn: confer French péritrope .] 1. Rotatory; circuitous. [ R.] 2. Having the axis of the seed perpendicular to the axis of the pericarp to which it is attached. 
peritropal 1. Rotatory; circuitous. 2. Having the axis of the seed perpendicular to the axis of the pericarp to which it is attached.