Qˈ-boat or Qˈ-ship noun (historical)

A merchant vessel manned by navy personnel and with concealed guns, used to deceive and destroy submarines

Qˈ-fever noun

An acute disease characterized by fever and muscular pains, transmitted by the bacterium Coxiella burnetii

Qˈ-sort noun

A psychological test designed to discover subjects' personality types by having them rank traits in the order most appropriate to their own personalities

Qˈ-train noun

A special train carrying railway police and with closed-circuit TV, used to deal with railway vandals and trespassers (named after Q-boat above)

Q

1. (as a medieval Roman numeral) 500
2. A measure of the efficiency of an electrical component as a ratio between stored energy and energy loss (also Q factor)
3. A unit of heat energy equal to 10¹⁸ British thermal units (US)

Q₁₀ noun (biology)

Temperature coefficient (qv)

Q

1. Electric charge (physics)
2. Quality or quality-value

Q̄

(medieval Roman numeral) 500000

Q¹ or q /kū/

The seventeenth letter in the modern English alphabet, sixteenth in the Roman, derived from the archaic Greek letter koppa (ϙ) (qv)

—In English, Q represents the sound /k/ and is normally followed by u (qu being pronounced /kw/, or in words from or modelled on French, Spanish, etc sometimes /k/), but sometimes without following u in transliteration of the related Semitic letters qoph (Hebrew) and qaf (Arabic) as in qadi (more usu cadi or kadi); Old English used the spelling cw instead of qu, and medieval Scots had the spelling quh for the sound /hw/ (English spelling wh)

Q-Celt or Q-Kelt noun

A speaker of Q-Celtic (see under Celt)