entosthoblast

Etymology
From (possibly due to association with superlatives in ) +.

Noun

 * 1)  The granule within the nucleolus or entoblast of a nucleated cell.
 * 2) * 1857-1862,, Contributions to the Natural History of the United States of America
 * when this [nucleolus] contains a still smaller body, this is called entosthoblast