a. rare. [a superlative form from CENTRE 17; cf. middlemost, topmost.] Most central; midmost.

1

1866.  Neale, Seq. & Hymns, 146. The spice-fields … that girdle the centremost mountain.

2

1871.  Joaquin Miller, Songs of Italy (1878), 53. In the centremost star Of all whirling stars.

3

1883.  Emma C. Piatt, Hist. Piatt Co., 125. The pioneer’s friend and weapon of defense, his gun, rested on wooden hooks fastened to the centermost joist of the ceiling.

4