U7 Out 



Ordinate. — When spots, puncta, etc., are placed 

 in rows. Thus the terms ordinato-punctate, etc., 

 are constructed. (L. ordinatus, in order.) 



Orichalceous. — Resembling gold in colour. A 

 splendour intermediate between that of gold 

 and brass. (Gr. oros, a mountain ; and chalJcos, 

 brass.) 



Orthoptera.^A family of Hexapoda. An order of 

 insects having four wings, the first pair being 

 leathery with longitudinal veins, and the second 

 pair fan-shaped. (Gr. orthos, straight, and 

 pteron, a wing.) 



Os. — A mouth ; a bone. (L.) 



Os hyoideum. — The tongue bone, the horny portion 

 of the lingula, which often protrudes beyond the 

 anterior margin of the mentum. (L. os, and 

 Gr. voides, "a bone on the top of the windpipe, 

 shaped like the letter U.") 



Osmeterium. — The large coloured V-shaped fleshy 

 process, which the caterpillars of the swallow- 

 tailed butterflies protrude from a transverse 

 slit on the dorsal surface of the prothoracic 

 segment. 



Osseous. — Resembling bone ; bony. (L. osseus, 

 from OS, ossis, a bone.) 



Ostia. — Lateral slit-like openings, along the sides 

 of the " heart." (L. ostium, a door, entrance.) 



Outer. — Being on the outside ; external ; opposed 

 to inner. (M.E. utter, a comparative form of 

 lit, out.) 



U 



