capitulum

Jerome, in fact, seems to have been the first to unambiguously use the term capitulum to refer to a numbered, titled segment of a text.

From The New Yorker ● Oct. 29, 2014

The articulating surfaces of the distal humerus consist of the trochlea medially and the capitulum laterally.

From Textbooks ● Jun. 19, 2013

The capitulum articulates with the radius bone of the forearm.

From Textbooks ● Jun. 19, 2013

In young specimens, peduncle nearly colourless; and in those under a quarter of an inch long in the capitulum, the top of the peduncle has not acquired its orange tint.

From A Monograph on the Sub-class Cirripedia With Figures of all the Species. by Charles Darwin

Entire length two inches, of which the capitulum is fourteen French lines.

From A Monograph on the Sub-class Cirripedia With Figures of all the Species. by Charles Darwin

Before the 'Opus Majus,' Bacon, according to his own account, had written nothing except a few slight treatises, "capitula quaedam."

From Cabinet Portrait Gallery of British Worthies Volume I by Anonymous

The trees had evidently not flowered last year; many of the buds were of some size, and such contained flower buds, each capitula being in addition enveloped in three bracteæ densely beset with brown hair. 

From Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries by William Griffith

Bacon, whose previous writings had been mostly scattered tracts, capitula quaedam, took fresh courage from this command of the pope.

From Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon" by Various

I find Midges, Plant-lice and Ants caught in it, as well as tufted seeds which have blown from the capitula of the Cichoriaceae.

From More Hunting Wasps by Alexander Teixeira de Mattos

The sterile bracts of the daisy occasionally produce capitula, and give rise to the hen-and-chickens daisy.

From Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" by Various