POL- 



247 



POL- 



bryo, which later form the second- 

 ary nucleus (dot.). 



polar plates, two narrow ciliated 

 areas produced in the transverse 

 plane, part of the equilibrium ap- 

 paratus of certain Coelenterates 

 (zool.\ 



polar rays, astral rays, as opp. 

 spindle-fibres (cyt.). 



polar rings, two ring-shaped cyto- 

 plasmic masses near the ovum poles 

 formed after union of the germ- 

 nuclei (cyt.}. 



polarity (polarTti) n. [Gk. polos, a 

 pivot.] The tendency of plants to 

 develop from the poles, roots 

 downwards, stems upwards (bot.) ; 

 the tendency of any ovum to place 

 itself with its axis corresponding 

 to that of the mother (emb.). 



pole plates, the end-plates or achro- 

 matic masses at the spindle poles 

 in Protozoa mitosis (cyt.\ 



Polian vesicles, interradial vesicles 

 opening into the ring-vessel of the 

 ambulacral system of most Star- 

 fishes and Holothurians (zool.). 



polioplasm (pol'Ioplazm) n. [Gk. 

 polios,gray ; plasma, form.] Spongio- 

 plasm. 



pollen (pol'6n) n. [L. fallen, fine 

 flour.] The male fertilizing element 

 of seed plants (&?/.). 



pollen tube, a tubular process de- 

 veloped from pollen grains after 

 attachment to the stigma (hot.). 



pollex (pol'gks) n. [L. pollex, thumb.] 

 The thumb, or innermost digit of 

 the normal five in the anterior 

 limb (zool.}. 



pollination (pSl'fnashun) n. [L. 

 pollen, fine flour.] Fertilization in 

 flowers ; transference of pollen from 

 stigma to ovule (&>/.). 



polliniferous (pSl'Inlfgrus) a. [L. 

 pollen, fine flour ; ferre, to carry.] 

 Pollen-bearing (dot.} ; adapted for 

 transferring pollen (zool.\ 



pollinium (polin'Ium) n. [L. pollen, 

 fine flour.] An agglutinated pollen 

 mass of Orchids and some other 

 plants (hot.}. 



pollinodium (pol'ino'dlum) n. [L. 

 pollen, fine flour ; Gk. eidos, form.] 

 A club-shaped branch of mycelium, 

 the antheridium of certain Fungi 

 (hot.}. 



pollinoid (pol'moid) n. [L. pollen, 

 fine flour ; Gk. eidos, form.] A 

 male gamete or spermatium (bot,\ 



polocytes (po'loslts) n. plu. [Gk. 

 polos, axis ; kytos, hollow.] Polar 

 bodies (cyt.). 



polyadelphous (pol'iadeTfus) a. [Gk. 

 polys, many ; adelphos, brother.] 

 Having stamens united by filaments 

 into more than two bundles (&?/.). 



polyandrous (pol'Ian'drus) a. [Gk. 

 polys, many; andros, male.] Having 

 twenty or more stamens (bot.). 



polyandry (pSl'ian'drl) n. [Gk. polys, 

 many ; andros,* male.] Condition 

 of a female consorting with several 

 males ; as in some Fishes (biol.\ 



polyarch (p811ark) a. [Gk. polys, 

 many ; arche, beginning.] Appl. 

 a root having many xylem bundles 

 united to form a plate in wood 

 tissue (bot.). 



polyaxon (pol'Iak'sSn) n. [Gk. polys, 

 many ; axis, an axis.] A type of 

 spicule laid down along numerous 

 axes (zool.}. 



polycarp (pol'ikarp) n. [Gk. polys, 

 many ; karpos, fruit.] One of the 

 gonads of some Ascidians dis- 

 tributed over the inner surface of 

 the mantle (zool.}. 



polycarpeUary (pdl'ikarpeTari) a. 

 [Gk. Polys, many ; karpos, fruit] 

 With compound gynoecmm (bot.). 



polycarpic, polycarpous. 



polycarpous (pol'ikar'pus) a. [Gk. 

 polys, many ; karpos, fruit.] With 

 numerous carpels ; appl. perennials 

 (bot.\ 



polycercous (pSl'fseVkus) a. [Gk. 

 polys, many ; kerkos, tail.] Appl. 

 bladderworms developing several 

 cysts, each with a head (zool.). 



polychasium (p8rika.'zium) n. [Gk. 

 polys, many ; chasis, division.]" A 

 cymose branch system when more 

 than two branches arise about the 

 same point (&?/.). 



polycotyledon (pSl'lkotlle'don) . 

 [Gk. Polys, many ; kotyledon, a 

 hollow vessel.] A plant with more 

 than two embryo lobes (&>/.). 



polycotyledonary (pSl'ikStlle'donarl) 

 a. [Gk. polys, many ; kotyledon^ 

 a hollow vessel.] Having the 

 placenta in many divisions or 

 cotyledons (zool.). 



