Definition of "ultimo" []

• In or of the month before the present one: on the 15th ultimo. (adverb)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Besides the loss which he sustained on the night of the 23d ultimo, which is estimated at 400, he cannot have suffered less between that period and the morning of the 18th instant than 3000; having, within that time, been repulsed in two general attempts to drive us from our position, and there having been continual cannonading and skirmishing during the whole of it."
• "A pair of diverticula arise from the fifth branchial pouch and form what are termed the ultimo-branchial bodies (Fig. 1175): these fuse with the thyroid gland, but probably contribute no true thyroid tissue."
• "I have to thank you for your favor of the 31st ultimo, which is just now received."