quark
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C2 noun kwɔːrk

quark

Meaning
A fundamental subatomic particle that combines to form protons and neutrons.
Example
Quarks form protons and neutrons.
C2 noun /ˈkwɒdrʊpɛd/

quadruped

Meaning
an animal that walks on four feet
Example
Most mammals are quadruped creatures adapted for running and stability.
C2 adjective /kwɪkˈsɑː.t̬ɪk/

quixotic

Meaning
Extremely idealistic, unrealistic, and impractical.
Example
His quixotic dreams often led to disappointment.
C2 verb, noun /ˈkweɪvər/

quaver

Meaning
To shake or tremble in speaking, typically through nervousness or emotion.
Example
Her voice quavered as she spoke before the crowd.
C2 noun /ˌkiː ˈviːv/

qui vive

Meaning
A state of alertness or vigilance.
Example
The guards were on the qui vive during the night.
C2 noun /ˈkwɪkˌsɪlvər/

quicksilver

Meaning
Mercury; a liquid metal, or something that is quick and unpredictable.
Example
His mood was as changeable as quicksilver.
C2 verb /kwɒf/

quaff

Meaning
to drink something heartily or in large gulps, especially an alcoholic drink
Example
He quaffed a mug of ale after the long day.
C2 adjective /kwəʊˈtɪdiən/

quotidian

Meaning
Ordinary or everyday, especially when mundane.
Example
He focused on the quotidian details of family life.
C2 noun /ˈkwaɪəˌtuːd/

quietude

Meaning
A state of stillness and tranquility.
Example
She enjoys the quietude of the countryside.
C2 noun /kwiːn kreɪp ˈmɜːrtəl/

Queen crape myrtle

Meaning
A flowering tree with colorful, crepe-like flowers, scientifically known as Lagerstroemia
Example
The Queen crape myrtle bloomed beautifully in the garden with its purple flowers.
C2 adjective /ˈkwɒdreɪt/

quadrate

Meaning
square or nearly square; having four sides or being suited or corresponding to something
Example
The tiles had a neat quadrate shape that made the floor look orderly.
C2 noun /kwaɪˈiːtəs/

Quietus

Meaning
death or something that causes death; a final settlement
Example
The hero received his quietus from the villain's sword.
C2 noun /kwɪˈɛsəns/

quiescence

Meaning
A state of quietness, inactivity, or dormancy.
Example
The volcano has been in a state of quiescence for decades.
C2 noun /ˈkwɪzlɪŋ/

quisling

Meaning
A traitor who collaborates with an enemy force occupying their country.
Example
During the war, he was branded a quisling for aiding the invaders.
C2 noun /ˈkwɔːrtoʊ/

quarto

Meaning
A book size resulting from folding each printed sheet into four leaves (eight pages).
Example
The library has rare Shakespeare quartos.
C2 adjective /kwaɪˈesnt/

Quiescent

Meaning
quiet; peaceful; inactive; dormant; at rest
Example
The volcano has been quiescent for over a century.
C2 adjective /ˈkwɛrʊləs/

querulous

Meaning
Complaining in a whining or irritable manner.
Example
The querulous customer kept finding fault with every detail.