AMB- 



11 



AMP- 



amboceptor (am'bose'p'to'r) n. [L. 

 ambo, both ; capere, to take.] An 

 antibody or specific immune body 

 necessary for the ferment-like action 

 of the complement on a toxin or 

 a red blood corpuscle (phys.}. 



ambulacra (am'bula'kra) n. plu. [L. 

 ambulare, to walk.] Locomotor 

 tube-feet of Echinoderms (zool.}. 



ambulacralia (am'bulakra'lia) n. plu. 

 [L. ambulare, to walk.] Ambu- 

 lacral plates, i.e. plates through 

 which the tube-feet protrude (zool.}. 



ambulacriform (ambulak'riform) a. 

 [L. ambulare, to walk ; forma, 

 shape.] Having the form or appear- 

 ance of ambulacra (zool.}. 



ameliflcation (amel'ifika'shun) n. 

 [M.E. amell, enamel ; L.facere, to 

 make.] Formation of tooth-enamel 

 (anat.}. 



aineloblast (ameToblast) n. [M.E. 

 amell, enamel ; Gk. blastos, bud.] 

 A columnar or hexagonal cell about 

 five times as long as it is broad, an 

 enamel-forming cell ; a cell of the 

 internal epithelium of the enamel 

 organ (anat.}. 



amentaceous (amgnta'shus) a. [L. 

 amentum, a thong.] Appl. plants 

 bearing aments or catkins (bot.). 



amentiferous (amgntlferus) a. [L. 

 amentum, a thong ; ferre, to carry.] 

 Amentaceous. 



amentum (amen'tum) n. [L. amentum, 

 a thong.] A catkin, consisting of 

 a bracted axis bearing unisexual 

 flowers as in the poplar and willow 

 (**> 



ametabolic (amSt'abol'ik) a. [Gk. a, 

 without ; metabole, change.] Appl. 

 insects that do not pass through 

 any marked metamorphosis (zool.}. 



amicron (amik'ron)' n. [Gk. a, with- 

 out ; mikros, small.] An element 

 so small that even the ultramicro- 

 scope can only indicate it as a 

 diffuse illumination in the track of 

 the beam ; cf. submicron (phys.}. 



amlcronucleate (ami'kronu'kleat) a. 

 [Gk. a, without ; mikros, small ; L. 

 nucleus, kernel.] Appl. fragments 

 of certain Protozoa in which there 

 is no micronucleus (zool.}. 



amitosis (amito'sis) n. [Gk. a, with- 

 out ; mitos, thread.] Cell-division 

 and cleavage of the nucleus with- 



out the thread-like formation of the 

 nuclear material (cyt.}. 



ammonltiferous (am'onltlf'e'rus) a. 

 [Gk. Amman, Jupiter; L. ferre, to 

 carry.] Containing the fossil re- 

 mains of Ammonites (pal.}. 



amoeba (ame'ba) n. [Gk. amoibe, ex- 

 change.] A protozoon in which the 

 shape is subject to constant altera- 

 tions due to the formation and 

 retraction of pseudopodia (zool.}. 



amoebifonn (ame'biform) a. [Gk. 

 amoibe, change ; L. forma, shape.] 

 Shaped like or resembling an 

 amoeba (biol.}. 



amoebocyte (ame'boslt) . [Gk. 

 amoibe, change ; kytos, hollow.] 

 Any cell having the shape or pro- 

 perties of an amoeba, especially 

 certain cells in the coelom of Ech- 

 inoderms ; a leucocyte (zool.}. 



amoeboid (ame'boid) a. [Gk. amoibe, 

 change ; eidos, shape.] Resembling 

 an amoeba in shape or in properties 

 (zool.}. 



amoebula (ame'bula) n. [Gk. amoibe, 

 change.] The swarm-spore of a 

 protozoan when furnished with 

 pseudopodia (zool.}. 



amorphous (am&r'fus) a. [Gk. a, 

 without ; morphe, shape.] Inde- 

 terminate, or of irregular form. 



amphiarthrosis (am'fiarthro'sls) n. 

 [Gk. amphi, both ; arthron, joint.] 

 A slightly movable articulation, as 

 a symphysis or syndesmosis (anat.}. 



amphiaster (am'ftas'te'r) n. [Gk. 

 amphi, both ; aster, star.] The 

 two asters connected by the 

 achromatic spindle formed in 

 mitotic cell division (cyt.). 



amphibious (amfib'ius) a. [Gk. 

 amphi, both ; bios, life.] Adapted 

 for life either on land or in water 

 (biol.}. 



amphiblastic (am'fiblas'tlk) a. [Gk. 

 amphi, both ; blastos, bud.] Having 

 unequal segmentation, appl. telo- 

 lecithal ova with complete segmen- 

 tation (biol.}. 



amphiblastula (am'fiblas'tula) n. [Gk. 

 amphi, both ; blastos, bud.] Stage 

 in the development of certain 

 sponges, in which the posterior 

 end of the embryo is composed 

 of granular archaeocytes, and the 

 anterior end of flagellate cells (zool.}. 



