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alloiogenesis (al'oiojen'esis) n. [Gk. 

 alloios, different ; genesis, descent.] 

 The alternation in a life-history of 

 a sexual and a non-sexual form ; 

 alternation of generations (biol.}. 



allopelagic (al'opelaj'ik) a. [Gk. allos, 

 other ; pelagos, sea.] Pert, organ- 

 isms found at any depth of the sea 

 uninfluenced by heat or cold (biol.}. 



alloplasmatic (al'dplasmat'ik) a. [Gk. 

 allos, other ; plasma, something 

 moulded.] Appl. the differentiated 

 portion of cell protoplasm (cyt.). 



alloplast (al'oplast) n. [Gk. allos, 

 other ; plastos, formed.] A morpho- 

 logical cell-unit of more than one 

 kind of tissue (cyt.}. 



alluvial (alu'vial, aloo-) a. [L. alluere, 

 to wash to.] Pert, or found in 

 deposits laid down by running 

 water (pal.}. 



alsinaceous (alsina'shiis) a. [Gk. 

 alsine, chickweed.] Appl. a poly- 

 petalous corolla where intervals 

 occur between the petals, as in the 

 chickweed (bot.}. 



alteration theory, explains the 

 electromotive forces of nerve and 

 musclebyalterations in the chemical 

 composition of the tissue at the 

 cross-section (phys.}. 



alternate (alter'nar, olteVnat) a. [L. 

 alternus, one after another.] Appl. 

 leaves or branches occurring at 

 different levels on opposite sides of 

 the stem (bot.}. 



alternation of generations, the 

 occurrence in one life-history of 

 two or more different forms differ- 

 ently produced, as in the polypoid 

 and medusoid stages of Hydroids 

 (biol.}. 



alternation of parts, it is the general 

 rule that leaves of the different 

 whorls alternate in position with 

 each other, sepals with petals, 

 stamens with petals (tot.). 



alternlplnnate (alteYnipin'at, 61-) a. 

 [L. alternus, one after another ; 

 pinna, wing.] Appl. leaflets or 

 pinnae arising alternately on each 

 side of the mid-rib (hot}. 



altrices (altrl'sez, al'trlsgz) n. plu. 

 [L. altriX) nourishes] Appl. birds 

 whose young are hatched in a very 

 immature condition (zool.}. 



alula (al'ula) n. [L. alula, dim. of 



ala, wing.] A small lobe separated 

 off from the wing-base on its pos- 

 terior edge in certain insects ; false 

 wing of birds (zool.}. 



alveola (alve'dla) n. [L. alveolus, a 

 small cavity.] A pit on the surface 

 of an organ (bot.}. 



alveolar (alve'olar) a. [L. alveolus, 

 a small pit.] Pert, a tooth socket 

 or alveolus ; appl. artery, nerve, 

 process, canal, in connection with 

 the jaw-bone (anat.) ; appl. a par- 

 ticular stage in protoplasm ; and to 

 small cavities in the lungs (zool.} ; 

 alveolar point see prosthlon. 



alveolate (alve'olat) a. [L. alveolatus, 

 pitted.] Deeply pitted or honey- 

 combed. 



alveolus (alve'olus) . [L. alveolus, 

 a small pit.] A tooth socket or 

 small pit or depression (anat.) ; the 

 pyramidal ossicle supporting a tooth 

 in the sea-urchin (zool.}. 



alveus (al'veus) n. [L. alveus, cavity.] 

 A thin white layer on the ventricular 

 surface of the hippocampus (anat.}. 



amacrine (am'akrin) a. [Gk. a, not ; 

 makros, long ; fs, fibre.] Appl. 

 cells occurring in the inner nuclear 

 layer of the retina (anat}. 



ambidextrous (am'bidgk'strus) a. [L. 

 ambo, both ; dexter, right.] Able 

 to use both hands with equal ease. 



ambiens (am'bignz) n. [L. ambire, to 

 go round.] A thigh muscle in cer- 

 tain birds, the action of which causes 

 the toes to grasp the perch (zool.}. 



ambiparous (amblp'arus) a. [L. ambo, 

 both; parere, to beget.] Appl. 

 buds as they contain the beginnings 

 of both flowers and leaves (hot.}. 



ambisporangiate (am'blsporan'jTat) 

 a. [L. ambo, both ; Gk. sporos, 

 seed ; anggeion, box.] Appl. plants 

 with sporophylls bearing both 

 megasporangia and microsporangia 

 (bot.). 



ambital (am'bital) a. [L. ambire, to 

 go round.] Appl. interambulacral 

 and antambulacral plates of Aster- 

 oids ; the outer skeleton of arm of 

 Ophiuroids (zool.} . 



ambitus (am'bitus) n. [L. ambire, to 

 go around.] The outer edge or 

 margin of a thing ; the outline of 

 an echinoid shell viewed from the 

 apical pole (zool.}. 



