EPI- 



94 



EPI- 



portion of the ventral part of the 

 hyoid arch ; n. the upper element 

 of the ventral portion (zool.}. 



epilabrum (ep'ilab'rum) n. [Gk. 'epi, 

 upon ; L. labrum, lip.] A process 

 at the side of the labrum in Myria- 

 pods (zool.}. 



epimandibular (ep'imandlb'ular) a. 

 [Gk. epi, upon ; L. mandibulum, 

 jaw.] Pert, a bone in the lower 

 jaw of vertebrates (zool.}. 



epimeral (epim'eral) a. [Gk. epi, 

 upon ; meros, part.] Pert, epimeron. 



epimere (ep'imer) n. [Gk. epi, upon ; 

 meros, part.] The upper region, 

 or dorsal muscle-plate of the meso- 

 thelial wall (smb.}. 



epimerite (epim'e'rlt) n. [Gk. epi, 

 upon ; meros, part.] The deciduous 

 portion of the protomerite in certain 

 Gregarines (zool.}. 



epimeron (epim'eron) n. [Gk. epi, 

 upon ; meros, part.] A portion of 

 the pleuron in insects which may 

 be posterior or nearly as far forward 

 as the episternum ; a portion of the 

 arthropod segment between the 

 tergum and the limb insertions 

 (zool.}. 



epimorphosis (e'p'imor'fosis) n. [Gk. 

 epi, upon ; morphe, change.] That 

 type of regeneration in which a 

 proliferation of new material pre- 

 cedes the development of the new 

 part (biol.}. 



epimysium (ep'imlz'ium) n. [Gk. epi, 

 upon ; mys, muscle.] The sheath 

 of areolar tissue which invests the 

 entire muscle ; cf. perimysium 

 (anal.}. 



epinasty (ep'inas'ti) n. [Gk. epi, upon ; 

 nastos, pressed close.] The more 

 rapid growth of the upper surface 

 of a dorso-ventral organ, e.g. a 

 leaf, thus causing an unrolling or 

 downward curvature (bot.}. 



epineural (ep'inu'ral) a. [Gk. epi, 

 upon ; neuron, nerve.] Arising 

 from the neural arch of a vertebra 

 (anat.} ; pert, canal immediately 

 below the radial nerve cord in the 

 Ophiuroidea, which represents the 

 missing ambulacral groove (zool.}. 



epineurium (ep'mu'rium) n. [Gk. 

 epi, upon ; neuron, nerve.] The 

 external sheath of a nerve cord 

 (anat.}. 



epiotic (ep'iot'ik) a. [Gk. epi, upon ; 

 ous, the ear.] Pert, the upper ele- 

 ment of the bony capsule of the ear 

 (anal.}. 



epiparasite (ep'ipar'asit) n. [Gk. epi, 

 upon ; para, beside ; sites, food.] 

 Ectoparasite. 



epipetalous (ep'ipet'alus) a. [Gk. cpi, 

 upon ; petalon, petal.] Having the 

 stamens inserted on the petals (bot.}. 



epipharyngeal (ep'ifaYinje'al, ep'i- 

 farin'jeal) a. [Gk. ept, upon ; 

 pharyngx, throat.] Pert, the upper 

 or dorsal aspect of the pharynx 

 (zool.}. 



epipharynx (ep'ifa'ringks) n. [Gk. 

 epi, upon ; pharyngx, throat.] A 

 projection on the roof of the mouth 

 cavity of certain insects ; the mem- 

 branous lining of labrum and 

 clypeus drawn out with the labrum 

 to form a piercing organ, as in 

 Diptera (zool.}. 



epiphragm (ep'ifram) n. [Gk. epi- 

 phragma, covering.] A layer of 

 hardened mucous matter, or a cal- 

 careous plate, closing the opening 

 of certain gastropod shells (zool.} ; 

 the membrane which closes the 

 capsule in certain Mosses ; a 

 closing membrane in the sporo- 

 phores of certain Fungi (bot.}. 



epiphysial (ep'ifiz'ial) a. [Gk. epi, 

 upon ; phyein, to grow.] Pert, or 

 similar to the epiphysis (zool.}. 



epiphysis (epif'isis) n. [Gk. epi, upon ; 

 phyein, to grow.] Any part or pro- 

 cess of a bone which is formed from 

 a separate centre of ossification and 

 later fuses with the bone ; the pineal 

 body (anat., zool.} ; a stout bar 

 firmly fused to the alveolus of each 

 jaw and articulating with the rotulae 

 in sea-urchins ; certain of the pro- 

 cesses on the tibia of insects (zool.}. 



epiphyte (ep'ifit) n. [Gk. epi, upon ; 

 phyton, plant.] Plant which lives 

 on other plants, but is not parasitic 

 (bot.}. 



epiphytic (ep'ifit'ik) a. [Gk. epi, 

 upon ; phyton, plant.] Pert, or 

 similar to an epiphyte (bot.}. 



epiphytotic (ep'ifitot'ik) a. [Gk. epi y 

 upon ;phytoft, plant.] Pert, disease 

 epidemic in plants (bot.}. 



epiplankton (ep'iplang'kton) n. [Gk. 

 epi, upon ; plangktos, wandering.] 



