ommatidiumn.

Brit.

/ˌɒməˈtɪdɪəm/, U.S.

/ˌɑməˈtɪdiəm/

Inflections: Plural ommatidia.

Origin: A borrowing from Greek, combined with an English element. Etymons: Greek ὄμματ- , ὄμμα , -idium comb. form.

Etymology: < ancient Greek ὄμματ-, ὄμμα eye (see ommateum n.) + -idium comb. form, after ommateum n. (see quot. 1884).

Zoology.

Each of the conical structural elements of a compound eye of an invertebrate.

ΘΚΠ

the world > animals > invertebrates > bodies or parts > [noun] > eye > facet of

facet1744

ommatidium1884

1884 J. Carrière in Q. Jrnl. Microsc. Sci. 24 674 The whole set of eye-units (ommatidia) of Musca vomitoria are enclosed in a chitinous capsule. [Note] The term ‘ommateum’ was introduced by Lankester in his memoir on the eyes of Scorpions to signify the entire soft parts of the non-segregate (unicorneal) eye of Arachnida and Hexapoda... The similar term ‘ommatidium’ is introduced in this paper to signify the units consisting each of a retinula and a vitrella, together with their sheath of pigment cells, into which the ommateum of the multi-corneal (polymeniscous) eye of Arthropods, is segregated.

1890 Amer. Jrnl. Sci. 139 410 In the compound eye of Phacops are continuous patches of scleral integument between the ommatidia.

1925 A. D. Imms Gen. Textbk. Entomol. i. 79 The distinctness of vision depends partly upon the number and size of the ommatidia.

1973 Sci. Amer. Dec. 35/3 The compound eye of Drosophila is a remarkable structure consisting of about 800 ommatidia: unit eyes containing eight receptor cells each.

1996 R. Dawkins Climbing Mount Improbable (1997) v. 166 Insofar as each ommatidium produces an image at all at the bottom of the narrow tube, that image is upside-down; the ommatidium works like a long, poor-quality, camera eye.

This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022).

单词	ommatidium
释义	ommatidiumn. Brit. /ˌɒməˈtɪdɪəm/, U.S. /ˌɑməˈtɪdiəm/ Inflections: Plural ommatidia. Origin: A borrowing from Greek, combined with an English element. Etymons: Greek ὄμματ- , ὄμμα , -idium comb. form. Etymology: < ancient Greek ὄμματ-, ὄμμα eye (see ommateum n.) + -idium comb. form, after ommateum n. (see quot. 1884). Zoology. Each of the conical structural elements of a compound eye of an invertebrate. ΘΚΠ the world > animals > invertebrates > bodies or parts > [noun] > eye > facet of facet1744 ommatidium1884 1884 J. Carrière in Q. Jrnl. Microsc. Sci. 24 674 The whole set of eye-units (ommatidia) of Musca vomitoria are enclosed in a chitinous capsule. [Note] The term ‘ommateum’ was introduced by Lankester in his memoir on the eyes of Scorpions to signify the entire soft parts of the non-segregate (unicorneal) eye of Arachnida and Hexapoda... The similar term ‘ommatidium’ is introduced in this paper to signify the units consisting each of a retinula and a vitrella, together with their sheath of pigment cells, into which the ommateum of the multi-corneal (polymeniscous) eye of Arthropods, is segregated. 1890 Amer. Jrnl. Sci. 139 410 In the compound eye of Phacops are continuous patches of scleral integument between the ommatidia. 1925 A. D. Imms Gen. Textbk. Entomol. i. 79 The distinctness of vision depends partly upon the number and size of the ommatidia. 1973 Sci. Amer. Dec. 35/3 The compound eye of Drosophila is a remarkable structure consisting of about 800 ommatidia: unit eyes containing eight receptor cells each. 1996 R. Dawkins Climbing Mount Improbable (1997) v. 166 Insofar as each ommatidium produces an image at all at the bottom of the narrow tube, that image is upside-down; the ommatidium works like a long, poor-quality, camera eye. This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022). < n.1884
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