Definition of Ocellus

1. Noun. An eye having a single lens.

Exact synonyms: Simple Eye, Stemma
Generic synonyms: Eye, Oculus, Optic
Specialized synonyms: Ommatidium

2. Noun. An eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color.
Exact synonyms: Eyespot
Generic synonyms: Marking

Definition of Ocellus

1. n. A little eye; a minute simple eye found in many invertebrates.

Definition of Ocellus

1. Noun. A simple eye consisting of a single lens and a small number of sensory cells ¹

2. Noun. An eyelike marking in the form of a spot or ring of colour, as on the wing of a butterfly or the tail of a peacock ¹

¹ Source:

Definition of Ocellus

1. a minute simple eye [n -LI]

Medical Definition of Ocellus

1. Origin: L, dim. Of oculus an eye. A little eye; a minute simple eye found in many invertebrates. An eyelike spot of colour, as those on the tail of the peacock. Source: Websters Dictionary (01 Mar 1998)

Ocellus Pictures

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Lexicographical Neighbors of Ocellus

ocellated crake
ocellated crakes
ocellated turkey
ocellus (current term)
och aye
och aye the noo

Literary usage of Ocellus

Below you will find example usage of this term as found in modern and/or classical literature:

1. An Introduction to Entomology by John Henry Comstock (1920)
"Fis- 153-—T we»visual cells from „. an ocellus of a pupa of A bis 1 he ... The structure of a primary ocellus. —The primary ocelli vary greatly in the ..."

2. An Introduction to Entomology: Or Elements of the Natural History of Insects by William Kirby, William Spence (1826)
"An ocellus without the pupil. Ex. Hipparchia Davus. 22. SPURIOUS ocellus (ocellus spurius). A circular spot without any defined iris or pupil. ..."

3. The Entomologist's Record and Journal of Variation by James William Tutt, Malcolm Burr (1890)
"In the very closely allied species E. menestheus, the upper ocellus is absent, and in ite place there is a costal red spot, exactly in the sams \m\\ks\xQ,«, ..."

4. The Entomologist; an Illustrated Journal of General Entomology by Edward Newman, Royal Entomological Society of London (1891)
"In E. constantinus there is no trace of red in the upper lunules of the under wings. The possession of a costal ocellus is very rare in the ..."

5. The Encyclopedia Britannica: A Dictionary of Arts, Sciences, Literature and by Hugh Chisholm (1911)
"In this way the ocellus becomes a true eye, very similar in. plan to the eyes of ... Vertical section of the Median Distal ocellus («' of the preceding ..."

6. The New American Cyclopaedia: A Popular Dictionary of General Knowledge by George Ripley, Charles Anderson Dana (1861)
"ocellus LUCANUS, a Pythagorean philosopher, born in Lucania in Italy, and supposed to have ... ocellus was translated into English by Thomas Taylor in 1831. ..."

7. List of the Specimens of Lepidopterous Insects in the Collection of the by Francis Walker, John Edward Gray (1855)
"Wings rather long, moderately broad, each with an ocellus. Fore wings falcate, slightly convex ... Hind wings broader lhau the fore wings ; ocellus larger. ..."

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