The Collaborative International Dictionary of English v.0.48:
Spindle-shaped \Spin"dle-shaped`\, a. 1. Having the shape of a spindle. [1913 Webster] 2. (Bot.) Thickest in the middle, and tapering to both ends; fusiform; -- applied chiefly to roots. [1913 Webster]WordNet (r) 3.0 (2006):
spindle-shaped adj 1: tapering at each end [syn: fusiform, spindle-shaped, cigar-shaped]