GLOSSARY. 



121 



Omo- (Gr. ci/mos, vmos, the shoulder.) 

 A prefix in compound words, sig- 

 nifying connection with the scapula 

 or shoulder-blade. 



Omohy'oid (Gr. M/J.OS, omos, the 

 shoulder ; hyoid bone). A name 

 given to a muscle attached to the 

 hyoid bone and the shoulder. 



Onguic'ulate and On'gulate. See 

 Unguic'ulate and Un'gulate. 



Onom'atopoeia (Gr. oz/o/xo, orioma, a 

 name ; voiew, poi'eo, I make). A 

 formation of words so as to pro- 

 duce a real or fancied resemblance 

 to the sounds which they are in- 

 tended to describe. 



Ontologlcal (Gr. wv, on, being; 

 Aoyo?, logos, discourse). Relat- 

 ing to the science of beings or 

 existing things. 



Ontol'ogy (Gr. cov, on, being ; ^.0705, 

 logon, discourse). The science of 

 being ; that part of metaphysics 

 which investigates and explains the 

 nature of beings. 



Onych'ia (Gr. oj>u|, on'ux, a nail.) 

 A whitlow. 



O'olite (Gr. uov, oon, an egg; \i6os, 

 lith'os, a stone). Limestone com- 

 posed of small rounded particles like 

 the eggs or roe of a fish : the name 

 in geology of a system of stratified 

 rocks, chai'acterised by the pre- 

 sence of limestone of this descrip- 

 tion. 



Oolitic (Gr. ODOV, oon, an egg ; \iOos, 

 lith'os, a stone). Pertaining to the 

 oolite. 



Opales'cence (Opal). A coloured shin- 

 ing lustre reflected from a single 

 spot in a mineral. 



Oper'cular (Lat. oper'culum, a lid). 

 Having, or of the nature of, a lid 

 or cover. 



Oper'culated (Lat. oper'culum, a lid). 

 Provided with an operculurn or 

 cover. 



Oper'culum (Lat. oper'io, I cover). A 

 lid or cover. 



OpMd'ians (Gr. ofis, oph'is, a ser- 

 pent). An order of reptiles, hav- 

 ing the serpent as the type. 



Ophiol'ogy (Gr. o<jus, oph'is, a ser- 

 pent ; \oyos, logos, discourse). 

 The description of serpents. 



Ophite (Gr. o^ts, oph'is, a serpent). 

 The mineral called serpentine. 



Ophthal'mia (Gr. b^Qa^os, ophthal'' 

 mos, the eye). Inflammation of the 

 eye. 



Ophthal'mic (Gr. 6$da\/ji.os, ophthal'- 

 mos, the eye). Belonging to the 

 eye. 



Ophthalmol'ogy (Gr. o00aA,uoy, oph- 

 thal' mos, the eye ; Aoyoy, logos, 

 discourse). The part of anatomi- 

 cal science which describes the eye? 

 and whatever relates to them. 



Ophthalmoai'eter (Gr. o^flaA^uos, oph- 

 thal'mos, the eye ; n-erpov, met'ron, 

 a measure). An instrument fur 

 measuring and comparing the 

 powers of vision of the two eyes. 



Ophthalmoscope (Gr. ocpeaX^os, oph- 

 thal! mos, the eye ; ovcoTTfw, skop'eo, 

 I view). An instrument for ex- 

 amining the interior ot the eye. 



O'piate (O'pium). A medicine con- 

 taining opium. 



Opisthocoelian (Gr. owKrOev, opis- 

 then, backwards ; KOI\OS, koilos, 

 hollow). Having the vertebra 

 hollow at the back part. 



Opisthot'onos (Gr. oirurdev, opis'then, 

 backwards; reivw, teino, I stretch). 

 A form of tetanus in which the 

 body is bent backwards. 



Opposition (Lat. ob, against; pono, 

 I place.) A standing over against ; 

 in astronomy, the position of a 

 heavenly body, as seen from the 

 earth, in the quarter directly oppo- 

 site the sun, so that the earth lies 

 in a direct line between it and the 

 sun. 



Opsiom'eter (Gr. tyis, opsis, vision ; 

 fj.erpov, met'ron, a measure). A 

 measurer of sight, or of the power 

 of vision. 



Opta'tive (Lat. opto, I wish). Wish- 

 ing : applied, in grammar, to that 

 mode or form of the verb by which 

 desire is expressed. 



Optic (Gr. o7TTo/*at, op'tomai, I see). 

 Relating to sight, or to the laws of 

 vision. 



Optic Nerves. The second pair of 

 nerves proceeding directly from the 

 brain, being the nerves of sight. 



Optics (Gr. oTTTOjuai, op'tomai, I see). 



