AMP- 



13 



ANA- 



amphithecium (auifithe'shiuuij n. 

 [Gk. amphi, both ; thekion, box.] 

 The peripheral layer of cells in the 

 sporangia of mosses (bot.). 



amphitoky (amfit'oki) n. [Gk. amphi, 

 both ; tokos, birth.] Partheno- 

 genetic reproduction of both males 

 and females (zoo!.). 



amphitriaene (am'fitrl'en) n. [Gk. 

 amphi, both ; triaina, trident.] A 

 double trident-shaped spicule (zool.). 



amphitrocha (amfit'roka) n. [Gk. 

 amphi, both ; trochos, wheel.] A 

 free-swimming annelid larva with 

 two rings of cilia (zool.). 



amphitropal (amfit'ropal) a. [Gk. 

 amphi, both ; trope, turning.] 

 Having the ovule inverted, with the 

 hilum in the middle of one side 

 (Ad*). 



amplectant (amplek'tant) a. [L. 

 amplecti, to embrace.] Clasping 

 or winding tightly round some 

 support, as tendrils in certain 

 plants (bot.). 



amplexlcaul (ampleVsikol) a. [L. 

 amplecti, to embrace ; caulis, stem.] 

 Clasping or surrounding the stem, 

 as the base of a leaf (dot.). 



ampliate (am'pliat) a. [L. ampliatus, 

 made wider.] Having the outer 

 edge of the wing prominent, as in 

 certain insects (zool.). 



ampulla (ampool'a, -pul'-) n. [L. 

 ampulla, flask with narrow neck 

 and globular body.] A membran- 

 ous vesicle ; part of the dilated 

 tubule in the mammary gland ; the 

 dilated portion at one end of each 

 of the semi-circular canals of the 

 ear (anat.) ; the internal reservoirs 

 on the ring canal of the water- 

 vascular system in Echinoderms ; 

 the terminal vesicle of sensory 

 canals of Elasmobranchs (zool.) ; 

 the submerged bladder of Utri- 

 cularia (bot). 



ampullaceal (ampula'seal) a. [L. 

 ampulla, flask.] Flask-shaped, 

 appl. arachnid spinning glands 

 which furnish silk for foundations, 

 lines, and radii (zool.). 



ampullaceous (ampula'shus) a. [L. 

 ampulla, flask.] Flask-shaped. 



ampullary (ampool'ari, -pul'-) a. [L. 

 ampulla, flask.] Pert, or resembling 

 an ampulla (anat.). 



ainyelinic (amielin'ik) a. [Gk. a, 

 without ; myelos, marrow.] Appl. 

 non-medullated nerve-fibres (anat.). 



amygdala (amig'dala) n. [L. from 

 Gk. amygdale, almond.] One of 

 the palatal tonsils ; a rounded lobe 

 at the side of the vallecula of the 

 cerebellum (anat.). 



amyloplast (am'iloplast') n. [L. 

 amylum, starch ; Gk. plastos, 

 formed.] A leucoplast or colourless 

 starch-forming granule in plants 

 (bot.). 



amyloplastid, amyloplast. 



amylum (am'ilum) n. [L. amylum, 

 starch.] Starch. 



anabiosis (an'ablo'sis) n. [Gk. ana, 

 up ; bios, life.] Resuscitation after 

 apparent death ; power of revivifica- 

 tion as seen in certain Tardigrada 

 (zool.). 



anabolism (anab'olizm) n. [Gk. ana, 

 up ; ballein, to throw.] The con- 

 structive chemical processes going 

 on in living organisms whereby food- 

 material is transformed into proto- 

 plasm (phys.). 



anacrogynous (anakroj'mus) a. [Gk. 

 an, not ; akros, apex ;gyne, female.] 

 Appl. certain liverworts in which 

 the archegonia or female repro- 

 ductive bodies do not arise at or 

 near the apex of a shoot (bot.). 



anacromyoldlan (anak'romioid'ian) a. 

 [Gk. ana, up ; akros, apex ; mys, 

 muscle.] With the syringeal 

 muscles attached -at the dorsal 

 ends of the bronchial semi-rings 

 (zool.). 



anaerobe (ana'Srob) n. [Gk. an, with- 

 out ; aer, air ; bios, life.] An organ- 

 ism capable of living in the absence 

 of free-oxygen ; appl. bacteria. 



anaesthesia (angsthe'zla) n. [Gk. an, 

 without ; aisthesis, feeling.] In- 

 sensibility (phys.). 



anagenesis (an'aje'n'e'sis) n. [Gk. ana, 

 again ; genesis, birth.] Regenera- 

 tion of tissues (phys.). 



anal (a'nal) a. [L. anus, anus.] Pert. 

 or situated at or near the anus ; 

 appl. posterior median unpaired 

 ventral fin of fishes, margin and 

 nerve of insect wing, posterior ven- 

 tral scute of reptiles (zool.). 



analogues (an'a!6gz) n. plu. [Gk. 

 analogia, proportion.] Organs of 



