96 



ORNITHOLOGISTS' COMPENDIUM. 



Oliva'ceous, 

 Olive, 



Ochra'ceous-Ru'fous (L. ochra'ceo-ru'fus), n. (Yellow ochre + burnt sienna 



+ light red). (Plate V. fig. 5.) 

 O'chre-Yel'low (L. ochra'ceo-flavus), n. The color of the pigment called 



yellow ochre. (Plate V. fig. 9.) 

 Oc'reate (L. ocrea'tus), a. Booted, or having the anterior covering of 



the tarsus undivided for the greater part of its length. 

 Odontor'nithes (L.), n. The name of an extinct order or primary group 



of birds, comprising forms which possessed teeth in sockets, and thus, 



as well as in other features, more nearly approaching the reptiles in 



their structure than any living forms. 

 Oil Green (L. ole.agm'eus), n. A dull light yellowish green. (Schoenfeld's 



yellow-green zinnober.) (Plate X. fig. 21.) 

 Olfac'tory, n. Pertaining to the sense of smell. 

 Oligoto'kous, a. Producing few eggs. 



(L. oliva'ceus; olivi'nus), n. A greenish brown color, like 

 that of olives. (Sepia -flight zinnober green.) (Plate 

 III. fig. 9.) ' V 



Ol'ive-Buff (L. ollva'ceo-lu'teus), n. (Yellow ochre + cobalt blue + white.) 



(Plate V. fig. 12.) 



Ol'ive-Gray (L. oliva'ceo-ca'nus), n. (Black + white + light cadmium ) 

 (Plate II. fig. H.) ' 



Ol'ive-Green (L. oliva'ceo-vi'ridis), n. A peculiar color, common in birds 

 (especially the Warblers, and hence sometimes called "warbler- 

 green"), produced by the mixture of yellow and gray, resulting in 

 a tint somewhat between olive and dull yellowish green. (Light 

 zinnober green -f- raw umber.) (Plate X. fig. 18.) 



Ol'ive-Yel'low (L. oliva'ceo-fla'vus), n. (Light cadmium + black + 

 white.) (Plate VI. fig. 16.) 



Omniv'orous (L. omniv'orus), a. Feeding upon anything eatable; eating 

 indiscriminately. 



Ome'goid (L. ome'goideus), a. Resembling in form the Greek capital 



letter Ome'ga, n. 

 Oolog'ical, a. Pertaining to oology. 

 Oorogy, n. The science of birds' eggs. 

 Opalescence, n. A reflection of pearly tints from a pale or milky 



ground-color. 

 Opales'cent (L. opahs'cens; margarita'ceus 1 ), a. Reflecting changeable 



tints from a pale or milky ground-color. 

 Opaque' (L. opa'cus), a. In descriptive Ornithology, the opposite of 



metallic, or brilliant. Dull, or without gloss. 

 Operculum (L.), n. A lid, or cover, such as the scale overhanging the 



nostrils (operculum naris) of many birds. 

 Ophtharmic (L. ophthalmicus), a. Pertaining to the eye. 

 Op'tic, a. Pertaining to the sight. 



1 Properly, this term means pearly; but as used in . descriptions the terms are 

 essentially synonymous. 



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