1

a

**:**not open

b

**:**enclosed

c

**:**composed entirely of closed tubes or vessels

a closed circulatory system

2

a
see also closed fracture

**:**having the skin intact with no underlying tissue exposed

*closed*wounds

b

of a head injury

**:**having the skull intact**:**not marked by fracture or penetration of the skull3

a

**:**forming a self-contained unit allowing no additions

closed association

b(1)

**:**traced by a moving point that returns to an arbitrary starting point

closed curve

also

**:**so formed that every plane section is a closed curveclosed surface

(2)

**:**characterized by mathematical elements that when subjected to an operation produce only elements of the same set

the set of whole numbers is closed under addition and multiplication

(3)

**:**containing all the limit points of every possible subset

a closed interval contains its endpoints

c

**:**characterized by continuous return and reuse of the working substance

a closed cooling system

d

of a racecourse

**:**having the same starting and finishing point4

a

**:**confined to a few

closed membership

b

**:**excluding participation of outsiders or witnesses

**:**conducted in strict secrecy

c

**:**rigidly excluding outside influence

a closed mind

5

**:**ending in a consonant

closed syllable

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Merriam-Webster unabridged
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