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OPI- 



ookinesis (6'okine'sTs) n. [Gk. oon, 

 egg ; kinein, to move.] The karyo- 

 kinetic stages of the nucleus in the 

 maturation and fertilization of the 

 egg (biol.). 



ooklnete (o'okinef) n. [Gk. oon, 

 egg ; kinein, to move.] The motile 

 worm-shaped stage of the zygote in 

 certain Protozoa (zool.}. 



oolemma (o'olem'a) n. [Gk. oon, 

 egg ; lemma, a husk.] The vitel- 

 line membrane of an egg (emb.}. 



oophore (6'ofor) n. [Gk. oon, egg ; 

 pherein, to bear.] Oophyte, which 

 see. 



oophoridium (o'oforid'mm) n. [Gk. 

 oon, egg ; pherein, to bear.] The 

 megasporangium in certain plants 

 (hot.}. 



oophyte (o'ofit) n. [Gk. oon, egg ; 

 phyton, a plant.] The sexual 

 generation in such plants as the 

 liverwort ; the gametophyte (bot.}. 



ooplasm (o'oplazm) n. [Gk. oon, egg ; 

 plasma, something moulded.] The 

 cytoplasm of an egg ; the yolk or 

 cell substance of an egg (smb.}. 



oopod (6'opod) n. [Gk. oon, egg ; 

 POUS, foot.] Any of the component 

 parts of a sting or ovipositor (zool.}. 



oosperm (6'ospgrm) n. [Gk. oon, egg- ; .. 

 sperma, seed.] A fertilized egg. 



oosphere (o'osfer) n. [Gk. oon, egg ; 

 sphaira, globe.] An egg before fer* - 

 tilization ; a female gamete (zool.}. 



oospore (6'ospor) n. [Gk. oon, egg ; 

 sporos, seed.] The zygote or fer- 

 tilized egg-cell (bot.} ; the encysted 

 zygote in certain Protozoa (zool.}. 



oostegite (oos'tggit) n. [Gk. oon, egg ; 

 stege, roof.] A plate-like structure 

 on the basal portion of a thoracic 

 limb in certain Crustaceans, which 

 forms or helps to form a receptacle 

 for the egg (zool.}. 



oostegopod (o'ostgg'opod) n. [Gk. 

 oon, egg ; stege, roof ; pous, foot.] 

 A thoracic foot bearing an oostegite 

 (zool.}. 



ootheca (6'othe'ka) n. [Gk. oon, egg ; 

 theke, a case.] A sporangium (hot.}; 

 an egg-case, as in Insects (zool.}. 



ootocoid (oot'okoid) a. [Gk. oon, egg ; 

 tokos, offspring ; cidos, form.] Giv- 

 ing ^birth -to the young at a very 

 early stagehand i then carrying them 



ootocous (oot'okiis) a. [Gk. oon, egg ; 

 toko s, offspring.] Egg-laying (zool.}. 



ootype (6'otlp) n. [Gk. oon, egg ; 

 type, place.] The part of the ovi- 

 duct where the shell is formed ; 

 the shell-gland of Turbellarians 

 and Trematodes (zool.}. 



ooze (ooz) n. [A.S. ivos, juice.] A 

 soft deposit found over large areas 

 of the floor of the ocean. 



oozooid (6'ozo'oid) n. [Gk. oon, egg ; 

 zoon, animal ; eidos, form.] Any 

 individual developed from an egg. 



opercle (opeVkl) n. [L. operculum, a 

 lid.] The posterior bone of a fish 

 operculum (zool.}. 



operculate (opfir'kulat) a. [L. oper- 

 culum, a lid.] Having a lid, as in 

 the capsule of Mosses (bot.} ; having 

 a covering for the gills, as in most 

 Fishes (zool.}. 



operculiferous (opeYkulIf'e'rus) a. [L. 

 operculum, a lid ; ferre, to bear.] 

 Operculate. 



operculiform (6p6r'kulif6rm') a. [L. 

 operculum, a lid ; forma, shape.] 

 Lid-like (bwl.}. 



operculigenous (opgr'kulij'gnus) a. 

 [L. operculum, lid ; Gk. genos, off- 

 spring.] Producing or forming a 

 lid (zool.}. 



operculum (opeYkulum) n. [L. oper- 

 culum, a lid.] A lid or flap, as in 

 the capsules of Mosses (bot.} ; any 

 of the convolutions covering the 

 island of Reil (anat.} ; the lid-like 

 structure seen in the Gastropods ; 

 the movable plates in the shell of 

 a Barnacle j the first pair of ab- 

 dominal appendages in Limulus ; 

 the gill-cover of Fishes ; the small 

 plate covering the opening of a 

 lung book in Spiders (zool.}. 



ophiopluteus (ofioploot'eus) n. [Gk. 

 ophis, serpent ; L. pluteus, shed.] 

 The pluteus larva of an Ophiuran 

 (zool.). 



ophryon (Sfrion) n. [Gk. ophrys, 

 brow.] The point of junction of 

 the median line of the face with 

 a line across the narrowest part of 

 the forehead (anat.}. 



opisthion (opis'thion) n. [Gk. opisthe, 

 behind.] The median point of the 

 posterior margin of the foramen 

 magnum (anat}. 



opisthocoelous (opis'those'lus) a. [Gk. 



