POLYGALA 



271 



POPLAR 



minated, bladder-like shells, belonging to 

 Protozoa; also called Radiolaria. 



Polygala, (pol-ig'a-la). [Gk. polys, much 

 go.1.0, milk.]=Milk-wort: an herb, the type 

 of Polygalacete. 



Polygalacese, (pol-i-gal-a'se-e). [Polygala, q.v.] 

 = Milk-worts: herbs and shrubs, sometimes 

 twining, mostly bitter, with milky roots, be- 

 longing to Sapindales. 



Polygalic acid, (pol-i-gal'ik). [Polygala, q.v.] 

 =Saponic acid, q.v.; named from being ob- 

 tained from the plant polygala. 



Polygamous, (pol-ig'a-mus). [Gk. potys, many ; 

 gamos, marriage.] Having more wives than 

 one. 



Polyglycerin, ( pol-i-glis'er-in ). [Poly and 

 Glycerin, q.v.] A condensed variety of 

 glycerin. 



Polygastrica, ( pol-i-gas'tri-ka ). [Gk. polys, 

 many ; gaster, stomach.] = Infusoria : the 

 name given by Ehrenberg. 



Polygenetic, ( pol-i-gen-et'ik ). [Gk. pnly*, 

 many; {/ewo.?,kind.]=Havinga variety of kind. 



Polygon, (pol'i-gon). [Gk. polys, many; 

 gonia, corner.] A figure 

 bounded by more than 

 four straight lines. 



Polygonaoese, (pol-i-gon- 

 a'se-e. ) [Polygonum, 

 q.v.] = Buck wheats: 

 herbs belonging to 

 Silenales. 



Polygonatuin,(pol-i-gon- Polygons. 



a'tum). [Gk.polys, many; gony, knee.] A 

 plant belonging to Liliacese. 



Polygonum, (pol-igVnum). [Gk. polys, many; 

 gony, knee.] Bistort: snake-root, &c. : an 

 herb, the type of Polygonaceae. P. ariculare 

 = Knotgrass. P, persicaria= Persicaria. 



Polyhalite, (pol'i-ha-lit). [Gk. polys, many; 

 hals, salt.] A mineral, chiefly hydrated sul- 

 phate of potassium, magnesium, and calcium. 



Polyhedron, ( pol-i-hg'dron ). [Gk. polys, 

 many; hedra, side.] A solid having many sides . 



Polymeric, (pol-im'er-ik). [Gk. polys, many; 

 meros, part.] Related to polymerides, q.v. 



Polymerides, (pol-i-mer'i-dez). [Gk. polys, 

 many; meros, part.] Compound bodies hav- 

 ing the same proportion among the elements 

 (i.e., the same percentage in the composition) 

 with different properties, e.g., defiant gas, 

 CsH4 and oil gas, C^Hg. 



Polymorphism, (pol-i-mor'fizm). [Gk. polys, 

 many; morphe, shape.] Variety or diversity 

 of form. 



Polynomial, (pol-i-no'mi-al). [Gk. polys, many; 

 Gk. nomos, law.] Used of an algebraic 

 quantity having several terms, cf. Binomial. 



Polype, (pol'ip). [Gk. polys, many; pous, 

 foot.] = Polyp: an indivi- 

 dual of Polypi, q.v. 



Polypetalse, ( pol-i-pet'a-lg ). 

 [Polys and Petal, q.v.] 

 Plants, the flowers of which 

 have both calyx and corolla; 

 divided into Thalamiflorae 

 and Calyciflorse. 



Polypi, (pol'i-pi). [Gk, polys, 

 many; pans, fqoy 1. A Ppiyp. 



sub-division of Molluscoida; also used gene- 

 rally for some Coelenterata. v. Polyps. 2. 

 Plural of Polypus, q.v. 



Polypiaria, (pol-i-pi-a'ri-a). De Blainville's 

 term for Anthozoa, Bryozoa, &c. 



Polypina, (pol-i-pin'a). B urmeister's term for 

 Bryozoa and Anthozoa. 



Polypodiaceae, ( pol-i-pod-i-a'se-e. ) [Polypo- 

 dium, q.v.] = Ferns: plants, fructified by 

 means of spore cases on the back of the leaf 

 or frond, belonging to Filicales. 



Polypodium, ( pol-i-po'di-um ). [Gk. polyx, 

 many; pous, foot.] = Polypody : a fern, the 

 type of Polypodiaceae. 



Polypogon, (pol-i-po'gon). [Gk. polys, many; 

 pogon, awn.J=Beard-grass : a plant belong- 

 ing to Graminacese, named from the awns 

 being numerous. 



Polyps, (pol'ips). [Gk. polys, many; pous, 

 foot.] = Polyp flowers = Animal flowers = 

 Zoophyta, q.v.; also called Anthozoa. 



Polypus, (pol'i-pus). [The Latin word.] A 

 general term for any organism having a 

 number of feet; used specially for fleshy 

 tumours having numerous branches. 



Polysynthetio crystals, ( pol-i-sin-thet'ik ). 

 [Gk. polys, many; synthetos, compound.] 

 Those that are compound, i.e., made up of a 

 number of smaller crystals. 



Polythalamous, (pol-i-thal'a-mus). [Gk. poly.t, 

 many; thalamos, chamber.] P. shell, hav- 

 ing many chambers ; e.g., Foraminifera. 



Polyzoa, (pol-i-zo'a). [Gk. polys, many; zoon, 

 animal.] = Sea-mosses ; sea-mats = Bryozoa: 

 minute compound animals, belonging to 

 Molluscoida, with ciliated arms, having no 

 higher senses, nor organs of locomotion, but a 

 complete intestine and a nervous system, 

 and are usually fixed to foreign bodies. 



Pomaceae, (po-iua'se-e). [L. pomum, apple.] 

 =Apple-worts : trees and shrubs, belonging 

 to Rosales. 



Pomegranate, ( pom'gra-nat ). 

 apple ; granatus, many- 

 seeded.] A plant belong- 

 ing to Punica, q.v. 



Pompilus, (pom'pi-lus). A 

 small black and yellow 

 wasp, the type of the 

 family Pompilida?. 



Pond-weed. Horned P. = 

 Zannichellia. 



Pone, (pon). [Gk. ponos, 

 labour.] Term proposed 

 by Everett for a dynamica Pomegranate, 

 unit of weight. 



Pons Varolii, (ponz va-ro'li-i). [The Latin 

 name.] Formed by the junction, in front 

 of the medulla oblongata, of two sets of 

 fibres from the cerebellum of the brain. 



Pontederaceae, (pon-te-der-a'se-e). [S. Ponte- 

 dera of Padua.] = Poutederads : aquatic 

 herbs, with large flowers, belonging to 

 Liljales. 



Poor man's weather-glassr=Anagallis arvensis. 



Poplar, (pop'lar). [Populus, the Latin name.] 

 =Populus, q.v. Slack /*.=:Populus nigra. 

 Gray P.=Populus canescens. White P.= 

 Populus alba. 



