oblast
n.
5Russ oblast‘6 an administrative subdivision, or region, of a republic in the U.S.S.R.

oblate 1
adj.
5ModL oblatus < OB3 + 3latus as in prolatus (see PROLATE): from being thrust forward at the equator6 Geom. flattened at the poles !an oblate spheroid"

oblate 2
n.
5ML oblatus, offered, thrust forward < pp. of L offerre: see OFFER6 R.C.Ch. a person dedicated to the religious life; esp., a person living in or associated with a religious community but not bound by vows

oblectation. 1. the act of pleasing highly; the state of being greatly pleased; delight.

obnubilation - here’s all I could find:
AUTHOR'S DESCRIPTION: Pauciloquent Obnubilation is a small app that lets the user find 26 obscure English words and their definitions hidden away beneath a further obscuring alphabetic screen.

Obtruncate - to cut the head off

obturator - a device to keep gas from escaping from breech of Civil War breech loading cannon.

In urology, a “J” shaped metal sound that fits into a rubber catheter to facilitate passing it into the bladder. When the lecturer in Urology mentioned passing a sound up
the urethra, student beside me whispered: “Is this old bastard trying to kid ;us?” I had diffic;ulty keeping a straight face, mentally picturing the lecturer with penis meatus between; his lips, going “twee…..”


Obvelation - figure of speech, covering as if with a veil

obvolute
adj.
5L obvolutus, pp. of obvolvere, to wrap around < ob3 (see OB3) + volvere, to roll: see WALK6 having overlapping margins: said of leaves or petals: also ob4vo[lu#tive
ob#vo[lu4tion
n.
odometer
n.
5Fr odom\tre < Gr hodometros < hodos, way (see 3ODE1) + metron, MEASURE6 an instrument for measuring the distance traveled by a vehicle

I wonder how many people still say “speedometer then they should say “odometer”.