lacking eyes: eyeless fish that evolved in dark caves.
lacking sight; blind.

1560–70; eye + less

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World English Dictionary
eye1 (aɪ)
1.  the organ of sight of animals, containing light-sensitive cells associated with nerve fibres, so that light entering the eye is converted to nervous impulses that reach the brain. In man and other vertebrates the iris controls the amount of light entering the eye and the lens focuses the light onto the retinaRelated: ocular, oculate, ophthalmic, optic
2.  (often plural) the ability to see; sense of vision: weak eyes
3.  the visible external part of an eye, often including the area around it: heavy-lidded eyes; piercing eyes
4.  a look, glance, expression, or gaze: a stern eye
5.  a sexually inviting or provocative look (esp in the phrases give (someone) the (glad) eye, make eyes at)
6.  attention or observation (often in the phrases catch someone's eye, keep an eye on, cast an eye over)
7.  ability to recognize, judge, or appreciate: an eye for antiques
8.  (often plural) opinion, judgment, point of view, or authority: in the eyes of the law
9.  a structure or marking having the appearance of an eye, such as the bud on a twig or potato tuber or a spot on a butterfly wing
10.  a small loop or hole, as at one end of a needle
11.  a small area of low pressure and calm in the centre of a tornado or cyclone
12.  See photocell
13.  informal See private eye
14.  informal all eyes acutely vigilant or observant: the children were all eyes
15.  informal my eye, all my eye rubbish; nonsense
16.  an eye for an eye retributive or vengeful justice; retaliation
17.  (Caribbean) cut one's eye after someone, cut one's eye at someone, cut one's eye on someone to look rudely at a person and then turn one's face away sharply while closing one's eyes: a gesture of contempt
18.  (NZ) eyes out with every possible effort: he went at the job eyes out
19.  chiefly sport get one's eye in to become accustomed to the conditions, light, etc, with a consequent improvement in one's performance
20.  half an eye
 a.  a modicum of perceptiveness: anyone with half an eye can see she's in love
 b.  continuing unobtrusive observation or awareness: the dog had half an eye on the sheep
21.  have eyes for to be interested in: she has eyes only for him
22.  in one's mind's eye pictured within the mind; imagined or remembered vividly
23.  in the public eye exposed to public curiosity or publicity
24.  keep an eye open, keep an eye out to watch with special attention (for)
25.  keep one's eyes peeled, keep one's eyes skinned to watch vigilantly (for)
26.  look someone in the eye to look at someone openly and without shame or embarrassment
27.  old-fashioned make eyes, make sheep's eyes to ogle amorously
28.  more than meets the eye hidden motives, meaning, or facts
29.  (Austral), (NZ) pick the eyes out to select the best parts or pieces (of)
30.  see eye to eye to agree (with)
31.  (usually used with a negative) set eyes on, lay eyes on, clap eyes on to see: she had never laid eyes on him before
32.  nautical the eye of the wind the direction from which the wind is blowing
33.  turn a blind eye to, close one's eyes to to pretend not to notice or ignore deliberately
34.  up to one's eyes extremely busy (with)
35.  with a … eye in a … manner: he regards our success with a jealous eye
36.  (preposition) with an eye to, having an eye to
 a.  regarding; with reference to: with an eye to one's own interests
 b.  with the intention or purpose of: with an eye to reaching agreement
37.  with one's eyes open in the full knowledge of all relevant facts
38.  with one's eyes shut
 a.  with great ease, esp as a result of thorough familiarity: I could drive home with my eyes shut
 b.  without being aware of all the facts
vb , eyes, eyeing, eying, eyed
39.  to look at carefully or warily
40.  Also: eye up to look at in a manner indicating sexual interest; ogle
Related: ocular, oculate, ophthalmic, optic
[Old English ēage; related to Old Norse auga, Old High German ouga, Sanskrit aksi]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The pale, eyeless ant appears to be adapted to living underground, possibly surfacing at night to forage.
These inland caves are inhabited by a number of diverse eyeless and colorless crustaceans and other invertebrates.
Researchers also found an array of eyeless, or nearly eyeless, catfish and electric fish.
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