Based ppl. a.²

[f. BASE sb.¹ + -ED².] Having or standing on a base, esp. in comb., as broad-based; spec. in Crystallog. (see quot.)

1610.  Shaks., Temp., V. i. 46. The strong bass’d promontorie Haue I made shake.

1817.  R. Jameson, Charac. Min., 197. Based, when the primitive form is either a double pyramid, or a rhomboid, in which the summits are intercepted by planes perpendicular to the axis, which take the place of terminal planes. Based sulphur … is a double four-sided pyramid, truncated on the extremities.