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ultrasound

Ultrasound is sound with a frequency above the upper limit of human hearing, generally above about 20,000 hertz.

Noun physical_phenomenon Level 1399

ultrasound scan

An ultrasound scan is a medical examination that uses high-frequency sound waves to create images of structures inside the body.

Noun process_event Level 1399

underside

The lower or bottom surface of something.

Noun spatial_division Level 1399

underside

The concealed or unfavorable side of a situation, organization, or subject.

Noun abstract_condition Level 1399

underworld

The organized criminal world and the people involved in it.

Noun group_people Level 1399

union

The act or state of joining or combining people, things, or parts into one; a joining together.

Noun process_event Level 1399

union

A marriage or other intimate partnership, especially considered as a formal or lasting joining of two people.

Noun family_relation Level 1399

union

An organization formed by workers to protect and promote their rights and interests.

Noun social_institution Level 1399

union

A political joining of states, territories, or other constituent units into one country or governing body.

Noun social_institution Level 1399

union

A political or economic association of countries or states that cooperate under shared institutions or agreements.

Noun social_institution Level 1399

unpatterned

Having no decorative pattern or contrasting markings.

Adjective pattern_texture Level 1399

uplift

To make someone feel happier, more hopeful, or spiritually renewed.

Verb emotional_state Level 1399

uplift

A feeling of renewed hope or improved mood.

Noun emotion_feeling Level 1399

upper

Higher in social, economic, or organizational rank than others.

Adjective sequence Level 1399

upper

The part of a shoe or boot that covers the foot above the sole.

Noun clothing_accessory Level 1399

upper-class

Characteristic of or associated with people from the highest social class.

Adjective origin Level 1399

urge

To strongly encourage or prompt someone to do something.

Verb social_interaction Level 1399

user

A person who takes advantage of other people for personal benefit, especially in relationships.

Noun human Level 1399

user session

A temporary period during which a user communicates with or uses a computer system, website, or network.

Noun technology_digital Level 1399

vacuum

To clean a surface or area using a vacuum cleaner.

Verb physical_action Level 1399

vacuum

A space containing little or no matter, especially one from which air has been removed.

Noun physical_phenomenon Level 1399

vacuum

A vacuum is a situation in which something necessary, expected, or influential is lacking.

Noun abstract_condition Level 1399

valence

An atom’s capacity to form chemical bonds, expressed by the number of electrons it can lose, gain, or share.

Noun chemical_compound Level 1399

valency

The number of chemical bonds an atom of an element can form, determined by its bonding electrons.

Noun chemical_compound Level 1399

variation

One of several possible forms or versions of something.

Noun concept_idea Level 1399

variegated

Having areas of several different colors, especially on leaves.

Adjective pattern_texture Level 1399

variety

A particular type or form of something that differs from others of the same general kind.

Noun concept_idea Level 1399

vary

To be different across instances or from a usual, expected, or stated standard.

Verb change Level 1399

velvety

Having a soft, densely napped surface resembling velvet.

Adjective pattern_texture Level 1399

venom

Extreme anger or hatred expressed in speech or writing, especially in a malicious or spiteful way.

Noun emotion_feeling Level 1399

ventilate

To allow fresh air to circulate in a room or enclosed space.

Verb physical_action Level 1399

verbal

Relating to or expressed in words, especially spoken rather than written words.

Adjective linguistic Level 1399

verdict

A formal decision reached by a jury or judge in a legal trial.

Noun legal_concept Level 1399

vertex

A point where two or more lines, rays, or sides meet, especially a corner of a geometric figure.

Noun mathematical_concept Level 1399

vertex

The point on a parabola where it reaches its maximum or minimum value and changes direction.

Noun mathematical_concept Level 1399

view

To think of or consider someone or something in a particular way.

Verb mental_state Level 1399

village

A residential area, often purpose-built, that provides housing for people associated with a larger institution or event.

Noun geographic_place Level 1399

village community

The people who live in a village, considered collectively as a community.

Noun group_people Level 1399

vindication

The act or process of showing that someone or something is right, justified, or worthy of approval.

Noun process_event Level 1399

violet

A violet is a plant of the genus Viola, typically bearing five-petaled flowers and including pansies.

Noun plant Level 1399

viscosity

Viscosity is a fluid’s resistance to flowing, arising from its internal friction.

Noun quality_attribute Level 1399

vocative

Relating to the grammatical vocative case or to direct address.

Adjective linguistic Level 1399

voice-over

A voice-over is spoken commentary accompanying a visual work, often explaining what is shown or linking scenes.

Noun communication_information Level 1399

voice-over artist

A performer who records or delivers prepared speech for an audiobook, documentary, announcement, or other production, often without appearing on scree...

Noun occupation Level 1399

voting

The act of choosing a candidate or expressing a choice in an election by casting a vote.

Noun activity Level 1399

waffle

To speak or write in a lengthy, unclear, or evasive way without reaching a point.

Verb communication Level 1399

waffle

Informal, vague or evasive speech or writing that avoids saying anything definite.

Noun communication_information Level 1399

waiver

A voluntary decision to give up or not enforce a right, claim, rule, or requirement.

Noun legal_concept Level 1399

warrant

An official legal document authorizing an authority to take a specified action, such as making an arrest or searching a place.

Noun legal_document Level 1399

watercolor

To paint using watercolor paints, typically on paper.

Verb creation_action Level 1399

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