• headquarters : (n)
  ① the main office, or center of operations and control, of anyone in command, as in an army, police force, etc.
  ② the main office or center of control in any organization

42. quarantine [It., quarantina, space of forty days < quattuor, four] : (n)
① the period, orig. forty days, during which an arriving vessel suspected of carrying contagious disease is detained in port in strict isolation
② the place where such a vessel is stationed
③ any isolation or restriction on travel or passage imposed to keep contagious diseases, insect pests, etc. from spreading
④ a place where persons, animals, or plants having contagious diseases, insect pests, etc. are kept in isolation, or beyond which they may not travel

• quarantine office : 검역소
• quarantine officer :검역관

43. quart [quarte < quartus, a fourth < quattuor, four] :(n)
① a liquid measure, equal to 1/4 gal.(57.75 cu.in. or in Great Britain & Canada, 69.36 cu.in.)
② a dry measure, equal to 1/8 peck 

44. quarterback : Football, the player whose position is behind the line of scrimmage together with the fullback and halfbacks, and who calls the signals and directs the offensive plays

45. quarterfinal : 
(adj) Sports designating or of the round of matches immediately preceding the semifinals in a tournament
(n) a quarterfinal match/ 준준결승전/ 8강전

• semifinal :
  (adj) coming just before the final match, as of a tournament
  (n) a semifinal match/준결승전

46. quartermaster (n)
① Mil. an officer whose duty it is to provide troops with quarters, clothing, equipment, etc.
② Naut. a petty officer or mate who attends to ship's compass, navigation, signals, etc.

47. quaternary [quaternarius < quarterni, four together, four each < quater, four times < quattuor, four] : (adj) consisting of four; in sets of four

48. quaternion [quaternarius < quarterni, four together, four each < quater, four times < quattuor, four] : (n)
① a set of four
② Math. an expression that is the sum of four terms, one of which is real and three of which contain imaginary units, and that can be written as the sum of a scalar and a three-dimensional vector

49. tetrapod [tetra-, four + -ped, foot] :
① an insect characterized by having but four perfect legs, as certain of the butterflies 
② a concrete structure with four legs around its surface which is for the use of breakwaters/ 콘크리트로 만든 4각 (脚) 의 블록 ; 호안 (護岸) 용

50. tetragon : a plane figure with four angles and four sides; quadrangle

• tetragonal : (adj) 
  ① of, or having the form of, a tetragon; quadrangular
  ② designating or of a system of crystallization in which the three axes intersect at right angles and the two horizontal axes are equal

50-1. tetrahedron [tetra-, four + -hedra, face] : a polyhedron that has four faces/삼각뿔 

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First uploaded : July 22, 2000 / Last updated : March 18, 2002