PAR- 



227 



PAR- 



parapolar (parapo'lar) a. [Gk. para, 

 beside ; polos, a pivot.] Beside the 

 pole ; appl. the first two trunk cells 

 in the development of Rhombozoa 

 (zool.). 



parapophysis (par'apof'isis) n. [Gk. 

 para, beside ; apo, from ; physis, 

 growth.] A transverse process 

 arising from a vertebra centrum. 



parapteron (parap'teron) n. [Gk. 

 para, beside ;pteron, a wing.] The 

 tegula or shoulder-lappet or scapula 

 of an insect mesothorax (zool.}. 



parapterum, parapteron. 



parapyles (par^apllz) n. plu. [Gk. 

 para, beside ; pyle, a gate.] Two 

 accessory openings in certain de- 

 veloping Radiolarians (zool.). 



paraquadrate (parakwod'rat) n. [Gk. 

 para, beside; L. quadratus, squared.] 

 The squamosal, a hammer-shaped 

 investing bone supporting the 

 suspensorium, externally (zoo/.). 



pararectal (pararek'tal) a. [Gk. para, 

 beside ; L. rectus, straight.] Be- 

 side the rectum ; appl. fossa, lymph 

 glands (anat.). 



parasite (par'aslt) n. [Gk. para, be- 

 side ; sitos, food.] An organism 

 living with or within another to its 

 own advantage in food or shelter 

 (biol.\ 



parasitic (parasit'lk) a. [Gk. para, 

 beside ; sites, food.] Appl. an 

 organism living at the expense of 

 another, and in or on it (biol.). 



parasitic castration, castration 

 caused by the presence of a para- 

 site, as in certain male crabs in- 

 fested by Sacculina (biol.). 



parasitism (par'asitizm) n. [Gk.para, 

 beside ; sitos, food.] A form of 

 symbiosis in which one symbiont, 

 the parasite, receives advantage 

 to the detriment of the other, the 

 host (biol.). 



parasitology (par'asitol'oji) n. [Gk. 

 para, beside ; sitos, food ; logos, 

 discourse.] The science treating 

 of parasites, especially those affect- 

 ing human beings. 



parasphenoid (parasfe'noid) n. [Gk. 

 para, beside ; sphen, wedge ; eides, 

 like.] A membrane bone forming 

 the floor of the cranium in certain 

 Reptiles (zool.). 



parastemon (paraste'mSn) n. [Gk. 



para, beside ; stetnon, a warp.] A 

 sterile stamen (dot.). 



parasternum (parasteYnum) n. [Gk. 

 para, beside ; stcrnon, the breast.] 

 The sum-total of the abdominal 

 ribs of certain Reptiles (zool.). 



parastichy (paras'tikl) n. [Gk. para, 

 beside ; stichos, row.] A secondary 

 spiral in phyllotaxis (bot.). 



parately (parat'eli) n. [Gk. para, 

 beside ; telos, end.] Evolution 

 from unrelated material to that of 

 type, but resulting in superficial 

 resemblance (biol.). 



parathyroid (parathl'roid) a. [Gk. 

 para, beside ; thyreos, a shield.] 

 Beside the thyroid ; appl. small 

 brownish-red glands (anat.). 



paratonic (paratSn'ik) a. [Gk. para, 

 beside; tonos, pitch.] Stimulating; 

 appl. the influence of light on grow- 

 ing plants (bot.). 



paravesical (paraveVikal) a. [Gk. 

 para, beside ; vesica, bladder.] 

 Beside the bladder ; appl. a fossa 

 (anat.). 



paraxial (parak'sial) a. [Gk. para, 

 beside ; L. axis, axle.] Alongside 

 the axis ; appl. a medial column of 

 mesoderm (emb.). 



parencephalon (par'SnkeTalon, -s6f-) 

 n. \Gk.para, beside ; engkephalon, 

 brain.] One of paired cerebral 

 hemispheres. 



parenchyma (pareng'kima) n. [Gk. 

 para, beside ; engchyma, infusion.] 

 The soft, succulent tissue common- 

 est in plants (bot.) ; the ground- 

 work tissue of organs (zool.). 



parenchymalia (pargng'klma'llaj n. 

 plu. [Gk. para, beside ; engchytna, 

 infusion.] Spicules of the paren- 

 chyma of Hexactinellids (zoo/.). 



parenchymatous (pargngkim'atus) a. 

 [Gk. para, beside ; engchyma, in- 

 fusion.] Pert, or found in paren- 

 chyma ; appl. a kind of cell (bot.). 



parenchymula (pargngkim'ula) n. 

 [Gk. para, beside ; engchyma, in- 

 fusion.] A flagellate sponge larva 

 with cavity filled with gelatinous 

 connective tissue (zool.). 



parental generation, see F,, Pj. 



parhomology (par'hdmordji) n. [Gk. 

 para, beside ; homos, alike ; logos, 

 discourse.] Apparent similarity of 

 structure (biol.). 



