GLOSSARY OF TECHNICAL TERMS. 97 
O'ral (L. ora'lis), a. Pertaining to the mouth. 
Or'ange (L. auran'tius), n. A deep reddish yellow, like the rind of an 
orange. (Winsor & Newton's cadmium-yellow.) (Plate VI. fig. 3.) 
Or'ange-Buff (L. auran'tio-lu'teus), n. (Cadmium-orange -f white.) 
(Plate VI. fig. 22.) 
((L. auran'tio-ru'brum ; Jlam'meus ; ig'neus), n. A fine 
bright light red color, verging somewhat to orange, 
Ur'ange-Ked, like the pigment called orange-chrome. (Plate 
I VII. fig. 13.) 
Or'ange-Ochra'ceous (L. auran'tio-ochra'ceus), n. (Cadmium-orange -f- 
yellow ochre + burnt sienna.) (Plate V. fig. 3.) 
Or'ange-Ru'fous (L. awran'tio-ru'fus), n. (Neutral orange, or cadmium- 
orange + light red.) (Plate IV. fig. 13.) 
Or'ange-Vermirion (L. auran'tio-cinnabari'nus), n. See plate VII. fig. 12. 
(Scarlet-vermilion -|- orange-cadmium.) 
Or'ange- Yellow (L. auran'tio-jla/vus), n. A color intermediate between 
orange and yellow. 
Orbic'ular (L. orbicularis), a. Circular. 
Or'bit (L. or'bitus), n. The region immediately around the eye. 
Or'bital Ring, n. A ring or circle of color immediately surrounding the 
eye. (Plate XII. fig. 12.) 
Or'der (L. or'do, pi. ordines), n. In natural history, a group of families 
possessing in common peculiar characteristics. 
Ordinal, a. Pertaining to an order. 
Ornith/ic, a. Pertaining to birds. 
Ornithorogy, n. The science of birds. 
Ornithot'omy, n. The anatomy of birds. 
Or'piment Or'ange, n. A deep dull orange color, much less pure than 
cadmium. (Cadmium-orange + burnt sienna.) (Plate VI. fig. 1.) 
Os'cinine, a. Pertaining to the Oscines ; musical, or capable of singing. 
Os'cines (L.), n. The name of a natural group of singing passerine 
birds, comprising the singing-birds par excellence, characterized by 
a highly specialized vocal apparatus. (Same as Polymyodoz.) 
Os'seous, a. Bony. 
Os'sified, a. Become bony. 
Osteolog'ical, a. Pertaining to osteology. 
Osteorogy, n. The science of bones; description of the bones or the 
bony structure of animals ; also, the osseous system. 
Out'er Web (L. pogo'nium exte'rius ; pogo'nium externum), n. The outer 
web of a feather is that farthest from the central line of the body ; 
in wing-feathers it is that farthest from the base of the wing, or 
toward the outer edge of the wing. 
Out'er Toe, n. See plate XL 
O'val (L. ova'lis), a. Shaped like the longitudinal outline of an egg 
which has both ends of equal or of similar contour. (Plate XIV. 
fig. 5; plate XVI. fig. 11.) 
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