Aconitin 



Actinomycosis 



Acon'itin, the alkaloid derived from 

 monkshood, Aconitum Napellus, 

 Linn. 



A'corn, the fruit of the oak. 



Acotyle'don (a, without, KorvXySkv, 

 used for seed-lobe), a plant desti- 

 tute of cotyledons or seed-lobes ; 

 Cryptogams and such plants as 

 Cuscuta ; adj. acotyle'donous, 

 acotyledo'neus. 



acramphib'ryous (a/rpos, apex, d/*0l, 

 on both sides, /3/n;u>, to bud), plants 

 producing lateral as well as apical 

 buds ; Acramphib'rya, a division 

 proposed by Endlicher to em- 

 brace Dicotyledons and Gymno- 

 sperms. 



Acroblaste'sis (CIK/JOS, apex, j8Xa<rros, 

 a bud), when the germ-tube of 

 Lichens proceeds from an end of 

 the spore ; acroblas'tic, Celakov- 

 skv's term for the branch of an 

 inflorescence which arises from a 

 terminal bud ; Acrob'rya (/3/>uo>, to 

 bud), plants growing at the point 

 only, as all Acrogens having a 

 distinct axis ; adj. acrob'ryous. 



acrocarp'ous (a/cpos, apex, Kapirbs, 

 fruit), terminal fruited ; a main 

 division of Mosses ; acrod'romous 

 (5^6/tos, a course), venation-strands 

 uniting at the apex of the leaf, as 

 in Plantago; acrog'amous (yd/j.os, 

 marriage), plants producing the 

 egg-apparatus at the summit of the 

 embryo-sac, as in most Angiosperms 

 (Van Tieghem) ; Acrog'amy, may 

 be double, as when the pollen-tube 

 and egg-apparatus are both apical ; 

 or partly basigamic, either of male 

 (pollen-tube) or female (egg-ap- 

 paratus) (cf. BASIGAMOUS) ; acrog 7 - 

 enous (yei>os, race), (1) used of 

 plants growing at the apex, such 

 as Ac'rogens, Ferns ; (2) produced 

 at the end of a filament, as some 

 fungus spores ; Acrogonid'imn 

 (yovos, offspring, el5os, form), a 

 gonidium formed at the apex of a 

 gonidiophore ; acrog'ynous (yw^, a 

 woman), having the stem termin- 

 ated by female organs, as arehe- 

 gonia ; acrogyra'tus (gyratus, 



turned away), having an elastic 

 ring at the point (Lindley) as in 

 Schizaea. 



Ac'ronus (perhaps from aicpov, the 

 highest point), Necker's term for 

 an ovary without a basal disk. 



acronych'ius (a/cpos, apex, 8t>v, a claw), 

 curved like the claw of an animal. 



acrop'etal (dicpos, apex ; peto, I seek), 

 produced in a succession towards 

 the apex, as applied to develop- 

 ment of organs ; the antithesis 

 of basipetal ; Acrosarc'um (<rdp, 

 <rapKos, flesh), Desvaux's term for 

 a berry from an ovary with adnate 

 calyx, as the currant; acroscop'ic 

 (oTKOTrew, I see), looking towards 

 the summit ; the reverse of basi- 

 scopic ; Acrosperm'eae (o-Trep/m, a 

 seed), Ac'rosperms, those Angio- 

 sperms which are presumed to 

 have begun with simple poro- 

 gamous mode of impregnation ; cf. 

 PLEUROSPERM; Ac'rospire ((rireipa, 

 a coil), Grew's name for the first 

 sprout of a germinating seed, the 

 extruded radicle ; acrospi'red, ger- 

 minated, as in malting ; Ac'rospore 

 (O-TTO/JOL, a seed), a spore formed at the 

 summit of a sporophore or fila- 

 ment ; Acrot'onous (roVos, a cord), 

 the tissue of the pollen-sac in 

 Orchids prolonged to the upper 

 end of the anther. 



Actinench'yma (d/crk, a ray ; eyxvfia, 

 an infusion), cellular tissue formed 

 in a star-shaped manner, as seen in 

 a cross-section of Juncus ; actin'ic, 

 used of certain rays of the spectrum, 

 which have a powerful effect on 

 growth; Act'inism, the chemical 

 action of sunlight ; Act'inocarp, a 

 fruit which is actinocarp'ic (nap-trot, 

 fruit), having the carpels or pla- 

 centas radiating like the spokes of 

 a wheel ; actinomorph'ic, -ous, 

 (/io/0077, shape), having flowers of 

 a regular or star pattern, capable 

 of bisection in two or more planes 

 into similar halves ; Actinomyco'sis, 

 a disease in the jawbone of man and 

 animals attributed to a Fungus, 

 Nocardia Actinomycosis, Trev. j 



