ACT- 



ADE- 



actinocarpous (ak'tinokar'pus) a. [Gk. 

 aktis, ray ; karpos, fruit.] Appl. 

 plants with flowers and fruit radially 

 arranged (bot.). 



actinodrome (aktm'b'drom) a. [Gk. 

 aktis, ray ; dramas, a running.] 

 Veined palmately (hot.}. 



actinogonidial (ak'tinogonid'ial) a. 

 [Gk. aktis, ray ; gonos, offspring.] 

 Having radiately arranged genital 

 organs as in Stelleroids (zool.). 



actinoid (ak'tinoid) a. [Gk. aktis, ray ; 

 eidos, shape.] Rayed, star-shaped. 



actinomere (aktin'omer) n. [Gk. aktis, 

 ray ; meros, part.] A radial seg- 

 ment (zool.}. 



actinomorphic (ak'tinomor'f Ik), actino- 

 morphous (ak'tinomor'fus) a. [Gk. 

 aktis, ray ; morphe, shape.] Appl. 

 flowers which can be divided into 

 like halves by a vertical section 

 through the centre ; radiosym- 

 metrical. 



actinost (ak'tinost) n. [Gk. aktis, ray ; 

 os/eon, bone.] Basal bone of the 

 fin-rays in Teleosteans (zool.}. 



actinostome (aktin'ostom) n. [Gk. 

 aktis, ray ; stoma, mouth.] The 

 five-rayed oral aperture of the star- 

 fish (zool.}. 



actlnotrichium (ak'tinotrlk'ium) n. 

 [Gk. aktis, ray ; thrix, hair.] A 

 delicate unjointed horny fibre of 

 mesoblastic origin found at the 

 edge of all the fins in adult Tele- 

 ostomes, probably homologous with 

 the ceratotrichia of Elasmobranchs 

 (zool.}. 



actinotrocha (ak'tfnotro'ka) n. [Gk. 

 aktis, ray ; trochos, wheel.] Free- 

 swimming larval form of Phoronis 

 (zool.}. 



actinula (aktin'ula) n. [Gk. aktis, 

 ray.] A larval stage in some Hydro- 

 medusae, in which a coelenteron, 

 mouth, and tentacles are formed, 

 and cell differentiation has taken 

 place before the larva is set free 

 from the parent form (zool.}. 



aculeate (aku'leat) a. [L. aculeus, 

 prickle, thorn.] Having prickles 

 or sharp points (bot.}. 



aculeiform (akule'iform) a. [L. 

 aculeus, prickle ; forma, shape.] 

 Formed like a prickle or thorn 

 (bot.}. 



aculeus (aku'leus) n. [L. aculeus, 



prickle.] A prickle growing from 

 the bark, as in the rose (bot.} ; a 

 sting (zool.}. 



acuminate (aku'minat) a. [L. acumen. 

 point.] Drawn out into a long 

 point ; tapering (bot.} ; pointed 

 (zool.}. 



acuminiferous (akummlf'e'rus) a. [L. 

 acumen, point ; ferre, to carry.] 

 Having pointed tubercles (zoo/.}. 



acuminulate (ak'umm'ulat) a. [L. 

 acuminulus, dim. of acumen, point.] 

 Having a very sharp tapering point. 



acute (akut')#. [L. acutus, sharpened.] 

 Ending in a sharp point. 



acyclic (asik'llk) a. [Gk. a, without ; 

 kyklos, circle.] Appl. flowers in 

 which the series of floral leaves are 

 arranged in a spiral ; opp. cyclic 

 (**} 



adamantoblast (adaman'toblast) n. 

 [L. adamas, diamond ; Gk. blastos, 

 bud.] A cell of the internal epi- 

 thelial layer of the mammalian 

 enamel organ, columnar in shape ; 

 the enamel cell ; in many of the 

 lower forms the enamel organ con- 

 sists only of such cells (zool.}. 



adambulacral (ad'ambula'kral) a. 

 [L. ad, to ; ambulare, to walk.] 

 Appl. ossicles or structure adjacent 

 to the ambulacral areas in Echino- 

 derms (zool.}. 



adaptation (adapta'shun) n. [L. ad, 

 to ; aptare, to fit.] The process by 

 which an organism becomes fitted 

 to its environment ; a structure or 

 habit fitted for some special environ- 

 ment ; the fitting of cutaneous and 

 other sensations to a point when 

 discomfort ceases, as the physio- 

 logical zero in the case of adapta- 

 tion to temperature (phys.}. 



adduction (aduk'shun) n. [L. ad, to ; 

 ducere^ to lead.] The movement 

 towards the median axis (phys.}. 



adductor (aduk'tor) n. [L. ad, to ; 

 ducere, to lead.] Any muscle which 

 brings one part towards another 

 (anat.}. 



adeciduate (adesld'uat) a. [L. a, 

 away from ; df, from ; cadere, to 

 fall.] Not falling, or coming 

 away, appl. evergreens (bot.) ; 

 appl. placenta (zool.). 



adelocodonic (ad'61okod6n'lk, ade'- 

 I6kod6n'lk) a. [Gk. adelos, con- 



