[ca.pit.u.lum] n, pl -la [NL, fr. L, small head--more at chapter] (ca. 1755) 1: a rounded protuberance of an anatomical part (as a bone)
2: a racemose inflorescence (as of the buttonbush) with the axis shortened and dilated to form a rounded or flattened cluster of sessile flowers--see inflorescence illustration