Meaning: A protein that can be present on the surface of red blood cells.

Part of speech: noun

Example: Knowing your rhesus factor is important during pregnancy.

Category: Medicine

Synonyms:

• Rh factor
• blood type

Meaning: Relating to the art of rhetoric; often used to make a point rather than to elicit an answer.

Part of speech: adjective

Example: He asked a rhetorical question to emphasize his point.

Category: Arts

Synonyms:

• persuasive
• eloquent

Antonyms:

• unpersuasive
• ineffective

Meaning: Relating to or affected by rheumatism.

Part of speech: adjective

Example: He suffers from rheumatic pain in his joints.

Category: Medicine

Synonyms:

• arthritic
• inflammatory

Meaning: A term for various conditions causing pain and inflammation in the joints and muscles.

Part of speech: noun

Example: Rheumatism can affect people of all ages.

Category: Medicine

Synonyms:

• arthritis
• joint pain

Meaning: Inflammation of the nasal mucous membrane, often causing a runny nose.

Part of speech: noun

Example: Rhinitis can be caused by allergies or infections.

Category: Medicine

Synonyms:

• nasal inflammation
• allergic rhinitis

Meaning: A horizontal underground stem that can produce new shoots and roots.

Part of speech: noun

Example: Ginger grows from a rhizome.

Category: Nature

Synonyms:

• rootstock
• underground stem

Meaning: A four-sided shape with opposite sides that are equal in length.

Part of speech: noun

Example: A diamond is a type of rhombus.

Category: Mathematics

Synonyms:

• diamond
• parallelogram

Meaning: A method of contraception based on tracking the menstrual cycle.

Part of speech: noun

Example: Some couples use the rhythm method to avoid pregnancy.

Category: Health

Synonyms:

• natural family planning
• fertility awareness

Meaning: The group of instruments in a band that provides the rhythm.

Part of speech: noun

Example: The rhythm section of the band kept everyone in time.

Category: Music

Synonyms:

• backline
• percussion section

Meaning: A vitamin important for energy production and metabolism.

Part of speech: noun

Example: Riboflavin is found in foods like eggs and green vegetables.

Category: Nutrition

Synonyms:

• vitamin B2
• nutrient

Meaning: Having a lot of a particular quality or substance.

Part of speech: adjective

Example: This soil is nitrogen-rich.

Category: Nature

Synonyms:

• abundant
• fertile

Meaning: A scale used to measure the magnitude of earthquakes.

Part of speech: noun

Example: The earthquake registered 6.0 on the Richter scale.

Category: Science

Synonyms:

• magnitude scale
• seismic scale

Meaning: To bounce off a surface after hitting it.

Part of speech: verb

Example: The bullet ricocheted off the wall.

Category: Physics

Synonyms:

• bounce
• rebound

Meaning: The act of getting rid of something unwanted.

Part of speech: noun

Example: Good riddance to that old car!

Category: General

Synonyms:

• removal
• elimination

Meaning: Afflicted or burdened by something.

Part of speech: adjective

Example: The area is crime-ridden.

Category: General

Synonyms:

• afflicted
• burdened

Meaning: To be filled with something undesirable.

Part of speech: verb

Example: The old house was riddled with termites.

Category: Nature

Synonyms:

• infested
• permeated

Meaning: Having ridges or raised lines.

Part of speech: adjective

Example: The ridged surface of the roof helps with water drainage.

Category: Architecture

Synonyms:

• grooved
• striped

Meaning: In a way that is absurd or laughable.

Part of speech: adverb

Example: She was ridiculously talented at singing.

Category: Arts

Synonyms:

• absurdly
• ludicrously

Meaning: Commonly occurring; widespread.

Part of speech: adjective

Example: Corruption was rife in the organization.

Category: Society

Synonyms:

• abundant
• prevalent

Antonyms:

• rare
• uncommon

Meaning: To flip through something quickly, like pages.

Part of speech: verb

Example: She rifled through the papers to find the report.

Category: Arts › Literature

Synonyms:

• shuffle
• browse

Meaning: A soldier armed with a rifle.

Part of speech: noun

Example: The rifleman took his position on the hill.

Category: Military

Synonyms:

• shooter
• marksman

Meaning: The system of ropes and cables used to support a ship's sails.

Part of speech: noun

Example: The rigging of the ship was in good condition.

Category: Technology › Maritime

Synonyms:

• equipment
• gear

Meaning: Morally right or justifiable.

Part of speech: adjective

Example: He felt righteous anger at the injustice.

Category: Ethics

Synonyms:

• virtuous
• just

Antonyms:

• immoral
• unjust

Meaning: A person who holds conservative political views.

Part of speech: noun

Example: The rightist party won the election.

Category: Politics

Synonyms:

• conservative
• reactionary

Meaning: Relating to conservative political views.

Part of speech: adjective

Example: The right-wing party proposed new tax cuts.

Category: Politics

Synonyms:

• conservative
• reactionary

Meaning: A person who holds conservative political views.

Part of speech: noun

Example: The right-winger spoke at the rally.

Category: Politics

Synonyms:

• conservative
• reactionary

Meaning: Not flexible; stiff.

Part of speech: adjective

Example: The rigid structure of the building ensures safety.

Category: Science › Physics

Synonyms:

• stiff
• inflexible

Antonyms:

• flexible
• yielding

Meaning: Strict and demanding; thorough.

Part of speech: adjective

Example: The rigorous training prepared the athletes for competition.

Category: Education

Synonyms:

• strict
• thorough

Antonyms:

• lenient
• easy

Meaning: A person or thing that closely resembles another.

Part of speech: noun

Example: He is a ringer for the actor.

Category: Society

Synonyms:

• duplicate
• lookalike

Meaning: Protective clothing and equipment used by police during riots.

Part of speech: noun

Example: The officers wore riot gear to control the crowd.

Category: Politics › Law Enforcement

Meaning: Police units specially trained to handle riots.

Part of speech: noun

Example: The riot police were deployed to restore order.

Category: Politics › Law Enforcement

Meaning: A large shield used by police to protect against projectiles during riots.

Part of speech: noun

Example: The officer raised his riot shield to block the thrown objects.

Category: Politics › Law Enforcement

Meaning: Characterized by wild and uncontrolled behavior.

Part of speech: adjective

Example: The party was riotous, with everyone dancing and laughing.

Category: Arts › Literature

Meaning: A cord used to deploy a parachute.

Part of speech: noun

Example: He pulled the ripcord to open his parachute.

Category: Sports › Skydiving

Meaning: A quick, witty reply or comeback.

Part of speech: noun

Example: Her riposte left everyone in the room laughing.

Category: Arts › Literature

Meaning: Very lively or exciting.

Part of speech: adjective

Example: The concert was a rip-roaring success.

Category: Arts › Music

Meaning: To overcome a difficult situation or challenge.

Part of speech: verb

Example: She managed to rise above her problems.

Category: Personal Development › Resilience

Meaning: Moisture rising through walls from the ground.

Part of speech: noun

Example: Rising damp can cause damage to buildings.

Category: Science › Building

Meaning: The act of taking chances or risks.

Part of speech: noun

Example: Risk-taking can lead to great rewards.

Category: Business › Finance

Meaning: Relating to or done as part of a ritual.

Part of speech: adjective

Example: The ritualistic dance was mesmerizing.

Category: Culture › Ceremonies