SWI- 



317 



SYN- 



swiminerets, paired appendages 

 posterior to the walking-legs of 

 Crustaceans, functional partly for 

 swimming (zool.}. 



swimming bells, nectocalyces : 

 medusoid bell - like structures of 

 Siphonophores with velum and 

 radiating canals, serving to propel 

 the colony (zool.}. 



swimming or swim bladder, the 

 air bladder of Fishes, developed as 

 a diverticulum of the alimentary 

 canal, function not precisely 

 determined (zool.}. 



swimming funnel, the tube of Di- 

 branchiates through which water is 

 expelled from the mantle cavity, 

 expulsion providing the means of 

 propulsion (zool.}. 



swimming ovaries, groups of ripe 

 ova of Acanthocephala detached 

 and floating freely in the body 

 cavity (zool.}. 



swimming plates, in Ctenophores, 

 eight equidistant bands of ciliated 

 comb - like plates or comb - ribs, 

 propellers of the organism (zool.}. 



syconium (slko'nmm) n. [Gk. sykon, 

 fig.] A cyconus ; a multiple, suc- 

 culent, receptacular fruit (bot.}. 



symbiont (sim'biont) n. [Gk. syn, 

 with ; bioun, to live.] One of the 

 partners in symbiosis (biol.}. 



symbiosis (simblo'sis) n. [Gk. sym- 

 bioun, to live together.] A condition 

 in which two animals, two plants, 

 or plant and animal, live in mutually 

 beneficial partnership (biol.}. 



symbiote, symbiont. 



symbiotic (simblot'ik) a. [Gk. sym- 

 bioun, to live together.] Living in 

 beneficial partnership, as Clione, 

 Dromia (biol.}. 



symmetrical (slmet'rlkal) a. [Gk. 

 syn, with ; metron, measure.] 

 Regularly shaped ; divisible into 

 exactly similar halves (biol.}. 

 symmetry (slm'gtri) n. [Gk. syn, 

 with ; metron, measure.] State of 

 divisibility into similar halves ; 

 regularity of form ; similarity of 

 structure on each side of an axis, 

 central, dorsoventral, or antero- 

 posterior. See bilateral and radial 

 symmetry (biol.}. 



sympathetic (simpatheYlk) a. [Gk. 

 syn, with ; pathos, feeling.] Appl. 



the system of nerves supplying the 

 viscera and blood - vessels, and 

 intimately connected with the 

 spinal and some cerebral nerves 

 (anat.} ; appl. coloration in imita- 

 tion of surroundings (biol.}. 

 sympetalous (slmpeYalus) a. [Gk. 

 syn, with ; petalon, leaf.] Having 

 a tubular corolla formed by union 

 of petals (bot.}. 



symphily (sim'fill) n. [Gk. syn, with ; 

 philein, to love.] Commensalism 

 with mutual liking (zool.}. 

 symphyantherous, synantherous. 

 symphyllous, gamophyllous. 

 symphyogenesis (sim'fioje'n'e'sTs) n. 

 [Gk. symphyesthain, to grow to- 

 gether ; genesis, descent.] De- 

 velopment of an organ from the 

 union of two others, 

 symphysial (simffz'ial) a. [Gk. sym- 

 physis, a growing together.] Sym- 

 physeal ; symphysian ; pert, a 

 symphysis. 



symphysis (slm'flsls) n. [Gk. sym- 

 physis, a growing together.] The 

 line of junction of two pieces of 

 bone separate in early life, as the 

 pubic symphysis ; a slightly movable 

 articulation with the bony surfaces 

 connected by fibrocartilage ; cf. 

 syndesmosis (anat.}. 

 symplectic (slmpleVtik) n. [Gk. syn, 

 with ; plektos, plaited.] A bone 

 of the fish skull between quadrate 

 and hyomandibular (zool.}. 

 sympodial (simpo'dial) a. [Gk. syn, 

 with ; POUS, foot.] Pert, or re- 

 sembling a sympodium in principle 

 (bot.}. 



sympodite (sim'podit) n. [Gk. syn, 

 with ; pous, foot.] The protopodite 

 of Crustacea (zool.}. 

 sympodium (simpo'dium) n. _ [Gk. 

 syn, with ; pous, foot] A primary 

 axis consisting of a line connecting 

 the bases of consecutive branchings 

 (bot.}. 



synacme (stnak'me) n. [Gk. syn, with ; 

 akme, prime.] Condition when 

 stamens and pistils mature simul- 

 taneously ; synanthesis (bot.}. 

 synangium (slnan'jium) n. [Gk. syn, 

 with ; anggeion, a vessel.] A com- 

 pound sporangium in which the 

 sporangia are coherent, as in some 

 Ferns (bot.}. 



