PHY- 



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PIA- 



phyllozooid (fll'ozo'oid) n. [Gk. 

 phyllon, leaf; zoon, animal.] A 

 shield-shaped medusoid of pro- 

 tective function ; a hydrophyllium 

 of Hydromedusae (zool.). 



phylogenesis, phylogeny. 

 phylogenetic (fl'lqjengt'ik) a. [Gk. 

 phylon, race ; genesis, descent.] 

 Pert, race - history ; appl. repro- 

 ductive cells as opp. autogenetic or 

 body cells (biol.). 



phylogeny (flloj'eni) n. [Gk. phylon, 

 race ; genesis, descent.] The 

 history of the development of a 

 species or race, as opp. ontogeny, 

 that of the individual {biol.}. 



phylogerontic (fl'lqjgron'tlk) a. [Gk. 

 phylon, race ; geron, an old man.] 

 Appl. the decadent stage in race- 

 history (biol.). 



phylon (fi'lon), phylum (fl'lum) n. 

 phyla (fTla) plu. [Gk. phylon, a 

 race or tribe.] A group of animals 

 or plants constructed on a similar 

 general plan ; a division in classifi- 

 cation (biol.). 



phyloneanic (fi'lonean'ik) a. [Gk. 

 phylon, race ; neanikos, youthful.] 

 Appl. the youthful stage in race- 

 history (biol.'). 



phylonepionic (fl'longp'ionlk) a. [Gk. 

 phylon, race ; nepios, infant.] Appl. 

 the post-embryonic stage in race- 

 history (biol.). 



physicist (fiz'isist) n. [Gk. physikos, 

 physical.] An upholder of the 

 theory that vital phenomena are 

 explicable on a physico-chemical 

 basis (biol.). 



physiogeny (fiziqj'e'ni) n. [Gk. physis, 

 nature ; gene, production.] The 

 development of vital activities 

 (Haeckel). 



physiological zero, see zero. 



physiology (ffz'iol'oji) n. [Gk. physis, 

 nature ; logos, discourse.] The 

 study of functions and activities of 

 organisms. 



physoclistous (fi'soklls'tus) a. [Gk. 

 physa, bladder ; kleiein, to close.] 

 Having no channel connecting 

 swim-bladder and digestive tract, 

 as in most Teleosts (zool.). 



physodes (fl'sodz) n. plu. [Gk. physa, 

 a bubble.] Spindles of phoro- 

 glucin contained in the plasmodium 

 of certain Sarcodina (zool.). 



physostomous (fisos'tomus) a. [Gk. 

 physa, a bladder ; stoma, mouth.] 

 Having swim-bladder and digestive 

 tract connected throughout life by 

 the pneumatic duct, as in Ganoids 

 (zool.). 



phytobiology (fl'tobloTqji) n. [Gk. 

 phyton, plant ; bios, life ; logos, dis- 

 course.] The life-history of plants. 



phytochemistry (fftokem'istri) n. 

 [Gk. phyton, plant ; chymeia, an 

 infusion.] The chemistry of plant 

 life. 



phylogenesis (fi'tojen'e'sis) n. [Gk. 

 phyton, plant ; genesis, descent.] 

 The development of plants. 



phytogeography (fi'tojeog'rafi) n. 

 [Gk. phyton, plant ; ge, earth ; 

 graphein, to write.] Geographical 

 distribution of plants. 



phytoid (fi'toid) a. [Gk. phyton, 

 plant ; eidos, resemblance.] Plant- 

 like. 



phytology (fltol'djl) n. [Gk. phyton, 

 plant ; logos, discourse.] Botany. 



phytoma (flto'ma) n. [Gk. phyton, 

 plant.] Vegetative plant-substance 

 (bot.). 



phytomer (fl'tomer) n. [Gk. phyton, 

 plant ; meros, part.] A structural 

 unit of a plant ; a bud-bearing node 

 (bot.). 



phytomorphic (fl'tomor'fik) a. [Gk. 

 phyton, plant ; morphe, form.] With 

 plant-like structure. 



phyton (fl'ton) n. [Gk. phyton, plant.] 

 A rudimentary plant ; a phytomer 

 (bot.). 



phytonomy (fiton'oml) n. \Gk.phyton, 

 plant ; nomos, law.] The laws of 

 origin and development of plants. 



phytophagous (fitof'agus) a. [Gk. 

 phyton, plant ; phagein, to eat.] 

 Feeding on plants ; herbivorous 

 (zool.). 



phytophilous (fltofilus) a. [Gk. 

 phyton, plant ; philos, loving.] 

 Plant-eating (zool.). 



phytophysiology (fl'tofiz'iol'qji) n. 

 [Gk. phyton, plant ; physis, nature ; 

 logos, discourse.] Plant physiology, 

 a branch of Botany, 

 phytoplasm (fl'toplazm) n. [Gk. 

 phyton, plant ; plasma, something 



moulded.] The protoplasm of 



plants (bot.). 

 pia mater (pe'a mat'eY, pl'a ina'ter) n. 



