spindle-shaped; rounded and tapering from the middle toward each end, as some roots.

1740–50; < Latin fūs(us) spindle + -i- + -form

subfusiform, adjective
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World English Dictionary
fusiform (ˈfjuːzɪˌfɔːm)
elongated and tapering at both ends; spindle-shaped
[C18: from Latin fūsus spindle]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1746, from L. fusus spindle (see fuse (n.)) + -form.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fusiform fu·si·form (fyōō'zə-fôrm')
Tapering at each end; spindle-shaped.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The endothelium is of the same character as in the arteries, but its cells are more oval and less fusiform.
In an ordinary microscopic section, viewed by transmitted light, they appear as fusiform opaque spots.
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