OMM- 



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ponent elements of a compound 

 eye (zoo/.). 



ommatoids (om'a'toidz) n. pin. [Gk. 

 omma, eye ; eidos, form.] Two or 

 four light-coloured spots on the 

 last abdominal segment of Pedi- 

 palpi, of disputed function (zoo/.). 



ommatophore (Sm'atofor) n. [Gk. 

 omma, eye ; pherein, to bear.] 

 Any movable process bearing an 

 eye (zoo/.). 



omnivorous (omniv'orus) a. [L. 

 omnis, all ; vorare, to devour.] 

 Eating both animal and vegetable^ 

 tissue \zool.). 



omohyoid (o'mohl'oid) a. [Gk. 

 omos, shoulder; hyoeides, Y-shaped.] 

 Pert, shoulder and hyoid ; appl. a 

 muscle (anat.}. 



omoideum (omoid'eum) n. [Gk. 

 omos, shoulder ; eidos, shape.] 

 The pterygoid bone in a Bird's 

 skull (zoo/.). 



omosternum (o'mosteVnum) n. [Gk. 

 omos, shoulder ; sternon, breast.] 

 One of the elements of the Am- 

 phibian sternum (zoo/.). 



omphalic (omfal'Ik) a. [Gk. omphalos, 

 navel.] Pert, the umbilicus (anat.}. 



omphaloid (om'faloid) a. [Gk. 

 omphalos, navel ; eidos, like.] Like 

 a navel; having an umbilicus 

 (zoo/.). 



oinphaloidium (om'faioid'mm) n. 

 [Gk. omphalos, navel ; eidos, like.] 

 The scar at the hilum of a seed, 

 or the hilum itself (dot.}. 



omphalomesaraic (8m'fal6m6s'- 

 ara'lk), omphalomesenteric, which 

 see. 



omphalomesenteric (om'falomSs'Sn- 

 teVik) a. [Gk. omphalos, navel ; 

 mesenteron, mid-gut.] Pert, um- 

 bilicus and mesentery ; appl. veins, 

 ducts (anat.}. 



onchosphere (Qng'kosfer) n. [Gk. 

 ongkos, hook ; sphaira, a globe.] 

 The larval stage of a tapeworm 

 preceding the cysticercus stage ; 

 the proscolex or six-hooked em- 

 bryo stage of Cestoidea ; also 

 oncosphere (zoo/.). 



ontocycle (on'tosi'kl) n. [Gk. on, 

 being; kyklos, a circle.] Evolu- 

 tion which in its later stages tends 

 to produce forms exactly like those 

 in the early stages (biol.}. 



ontogenesis (5n'tqj6n'gsls) n. [Gk. 

 on, being ; genesis, descent.] The 

 life-history of a single individual 

 (biol.}. 



ontogenetic (on'toje'ne't'rk) a. [Gk. 

 on, being ; genesis, descent.] Pert. 

 ontogeny, or the development of 

 the individual (biol.}. 



ontogeny (ontqj'finl) n. [Gk. on, 

 being ; genos, birth.] Ontogenesis, 

 which see. 



onychium (onik'Ium) n. [Gk. onyx, 

 a nail.] The layer below the 

 nail (anat.} ; a pulvillus ; in some 

 spiders a special false articulation 

 at the end of the tarsus to bear 

 the claws (zoo/.). 



onychogenic (on'ikqjen'ik) a. [Gk. 

 onyx, nail ; genos, offspring.] Cap- 

 able of producing a nail or a nail- 

 like substance ; appl. a material 

 occurring in nail matrix and cells 

 forming the fibrous substance and 

 cuticula of hairs (phys.}. 



ooblastema (6'oblaste'ma) n. [Gk. 

 oon, egg ; blastos, bud.] The egg 

 after fertilization (zoo/.). 



oocyte (6'oslt) n. [Gk. oon, egg ; 

 kytos, hollow.] An egg before the 

 formation of the first polar body 

 (emb.} ; in Protozoa a stage in the 

 supposedly female cpnjugant before 

 it prepares for fertilization (zoo/.). 



ooecium (oe'shium) n. [Gk. oon, egg ; 

 oikos, house.] An ovicell (zoo/.). 



oogamete (o'og&met') . [Gk. 

 oon, egg ; gamos, marriage.] An 

 oosphere of Sporozoa (zoo/.). 



oogamous (oog'amus) a. [Gk, oon, 

 egg ; gamos, marriage.] Having 

 sexually differentiatedgametes (&?/.). 



oogenesis (6'6j6n'6sis) n. [Gk. oon, 

 e SS > genesis, descent.] Forma- 

 tion, development, and maturation 

 of the egg (biol.). 



oogloea (6'ogle'a) n. [Gk. oon, egg ; 

 gloia, glue.] Egg cement (zoo/.). 



oogonial (6'ogo'nial) a. [Gk. oon, 

 egg ; gonos, descent.] Pert, the 

 oogonium. 



oogonium (o'ogo'nlum) n. [Gk. oon, 

 egg ; gonos, offspring.] The female 

 reproductive organ in certain Thal- 

 lophytes (tot.) ; the mother egg-cell 

 (biol.}. 



ooid (6'oid) a. [Gk. oon, egg ; eidos, 

 form.] Egg-shaped. 



