139 Obc 



Nostril. — (E. nostril =znose-thrill, or nose-thirl ; 

 A.S. nos-u, nose.) See Rhinarium. 



Notum. — The dorsal surface of a segment — the 

 term is little used in this form, it is generally 

 taken with its preceding part, ex. pronotum, 

 etc. (Gr. notum, from notos, the back.) 



Nucha. — The nape ; the upper part of the coUum. 

 it includes the myoglyphides. (Arabic.) 



Nucleat, Nucleiform. — Possessing a nucleus ; in 

 the form of a nucleus. (L. nucleus, small nut, 

 kernel. — L. nut, stem of nux, a nut.) 



Nucleus. — A nerve-centre. (L.) 



Nudum.^Naked ; having no markings or dust 

 covering. (L. nudtts, naked.) 



Nutant. — (Head.) In observing the relations of the 

 head to the thorax, the term is used when its 

 longitudinal diameter forms an obtuse angle 

 with the axis of the body. Nodding ; bent 

 down. (L. nutans from nuto, to nod.) 



Nutant. — Bending over at the apex. (L. nutans.) 



Nymph. — The pupal stage of an insect which 

 undergoes incomplete metamorphosis. An 

 ancient term for papa. (L. nym/pha, a pupa.) 



Ob-.— A Latin prefix signifying in the way of, 

 toward, and also reversal. 



Obconical. — Of a reversed cone-shape — thickest 

 part, in front. (L. ob, and M.F. cone, — L. conus, 

 a cone.) 



Obcordate. — Inversely heart-shaped. (L. oh, and 

 cor, the heart.) 



