Describing a method of drilling for petroleum in which the pressure in the wellbore is kept lower than that of the formation being drilled, thus allowing fluid to enter the well as soon as it is found.

underballastverb

To load with insufficient ballast.

underbankedadj

Having inadequate access to financial services or formal banking facilities.

underbarnoun

A bar placed under a symbol.

underbarknoun

The inner layer of tree bark, beneath the overbark.

underbarreladj

Mounted beneath the barrel of a firearm.

underbarrieradj

Beneath a barrier.

underbeadlenoun

A subordinate beadle.

underbearverb

To support, endure.

underbearernoun

One who helps to bear or carry the corpse or accessories at a funeral.

underbeatverb

To beat too little, or less than usual.

underbednoun

An underlying base that supports a bed or foundation.

underbelliedadj

Having a specified kind of underbelly.

underbellynoun

The underside of an animal.

underbetnoun

a bet which is smaller than standard for a given situation

underbidverb

To bid too low.

underbiddernoun

The last person to drop out of an auction; the second-highest bidder.

underbillverb

To bill an inadequate amount.

underbindverb

To bind underneath.

underbitenoun

A malocclusion, in which the lower teeth extend past the upper ones

underblameverb

To blame insufficiently; to absolve.

underblanketnoun

A blanket placed directly on the mattress of a bed.

underblousenoun

A blouse worn under another garment, such as a waistcoat or vest

underblowverb

To fail to blow with sufficient force or energy

underboardnoun

A board that lies beneath something.

underboatedadj

Having an inadequate boat.

Spelling & Dictionary Insight

The English alphabetical index for the letter U contains 23,789 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 476 pages, and you are currently viewing page 125. Every row above is a dictionary-backed entry with a canonical slug, and each links through to a full definition page with pronunciation, senses, etymology, and related-word data where available.

On this page 50 of 50 entries carry a part-of-speech tag and 50 carry at least one stored definition. Coverage varies across letters because Wiktionary volunteers build entries at different speeds for different parts of the alphabet, letters with common starting sounds (S, C, T, P) usually have the densest coverage, while less frequent starters (X, Q, Z) tend to have shorter but more specialised lists. PlainSpell surfaces whatever data is present and links back to the source when a definition is not yet recorded.

For readers using this index as a spelling reference, the guarantee is that every form you see on the list is a documented English headword, not a guess, not a derived inflection lacking a lemma row. If a word you expected to find is absent from the "U" list, it usually means the form exists only as an inflection of another lemma (e.g. a past participle stored under the infinitive) or the entry has not yet been imported from Wiktionary. Use the search bar or the misspelling lookup to resolve these cases.