capable of being opened.

1815–25; open + -able

openability, noun
unopenable, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To openable
World English Dictionary
open (ˈəʊpən)
1.  not closed or barred: the door is open
2.  affording free passage, access, view, etc; not blocked or obstructed: the road is open for traffic
3.  not sealed, fastened, or wrapped: an open package
4.  having the interior part accessible: an open drawer
5.  extended, expanded, or unfolded: an open newspaper; an open flower
6.  ready for business: the shops are open
7.  able to be obtained; available: the position advertised last week is no longer open
8.  unobstructed by buildings, trees, etc: open countryside
9.  free to all to join, enter, use, visit, etc: an open competition
10.  unengaged or unoccupied: the doctor has an hour open for you to call
11.  See open season
12.  not decided or finalized: an open question
13.  ready to entertain new ideas; not biased or prejudiced: an open mind
14.  unreserved or candid: she was very open in her description
15.  liberal or generous: an open hand
16.  extended or eager to receive (esp in the phrase with open arms)
17.  exposed to view; blatant: open disregard of the law
18.  liable or susceptible: you will leave yourself open to attack if you speak
19.  (of climate or seasons) free from frost; mild
20.  free from navigational hazards, such as ice, sunken ships, etc: open water
21.  (US) without legal restrictions or enforceable regulations, esp in relation to gambling, vice, etc: an open town
22.  without barriers to prevent absconding: an open prison
23.  having large or numerous spacing or apertures: open ranks
24.  full of small openings or gaps; porous: an open texture
25.  printing (of type matter) generously leaded or widely spaced
26.  music
 a.  (of a violin or guitar string) not stopped with the finger
 b.  (of a pipe, such as an organ pipe) not closed at either end
 c.  (of a note) played on such a string or pipe
27.  commerce
 a.  in operation; active: an open account
 b.  unrestricted; unlimited: open credit; open insurance cover
28.  See open cheque
29.  (of a return ticket) not specifying a date for travel
30.  sport
 a.  (of a goal, court, etc) unguarded or relatively unprotected: the forward missed an open goal
 b.  (of a stance, esp in golf) characterized by the front of the body being turned forward
31.  (of a wound) exposed to the air
32.  (esp of the large intestine) free from obstruction
33.  undefended and of no military significance: an open city
34.  phonetics
 a.  denoting a vowel pronounced with the lips relatively wide apart
 b.  denoting a syllable that does not end in a consonant, as in pa
35.  chess (of a file) having no pawns on it
36.  maths (of a set) containing points whose neighbourhood consists of other points of the same set: points inside a circle are an open set
37.  computing (of software or a computer system) designed to an internationally agreed standard in order to allow communication between computers, irrespective of size, maufacturer, etc
vb (when intr, foll by on or onto) (when intr, sometimes foll by out)
38.  to move or cause to move from a closed or fastened position: to open a window
39.  to render, be, or become accessible or unobstructed: to open a road; to open a parcel; the door opens into the hall
40.  (intr) to come into or appear in view: the lake opened before us
41.  (tr) to puncture (a boil) so as to permit drainage
42.  to extend or unfold or cause to extend or unfold: to open a newspaper
43.  to disclose or uncover or be disclosed or uncovered: to open one's heart
44.  to cause (the mind) to become receptive or (of the mind) to become receptive
45.  to operate or cause to operate: to open a shop
46.  to make or become less compact or dense in structure: to open ranks
47.  to set or be set in action; start: to open a discussion; to open the batting
48.  (tr) to arrange for (a bank account, savings account, etc) usually by making an initial deposit
49.  to turn to a specified point in (a book, magazine, etc): open at page one
50.  law to make the opening statement in (a case before a court of law)
51.  (intr) cards to bet, bid, or lead first on a hand
52.  the open any wide or unobstructed space or expanse, esp of land or water
53.  See open air
54.  sport a competition which anyone may enter
55.  bring into the open to make evident or public
56.  come into the open to become) evident or public
[Old English; related to Old French open, epen, Old Saxon opan, Old High German offan]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
When you're done, you have a non-openable capsule filled with spent coffee grounds.
Large openable skylights that double as windows fill the area with natural
  light making it perfect for detail work.
The minimum openable area to the outdoors shall be based on the total floor
  area being ventilated.
Exhaust fans are allowed in lieu of installing an openable window in a bathroom.
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