ACI- 



ACT- 



acinus (as'fnus) . [L. acinus, berry.] 

 One of the pulpy drupes composing 

 the fruit of bramble or raspberry 

 (hot.} ; the sac-like termination of 

 a branched gland (anat.). 



acoelomate (ase'lomat) a, [Gk. a, 

 without ; koilos, hollow.] Appl. 

 animals not having a true body 

 cavity. 



acoelomatous,acoelous, acoelomate. 



acontia (akon'tia, akon'shia) n. plu. 

 [Gk. akontion, small javelin.] 

 Threadlike processes of the mesen- 

 teric filaments armed with stinging 

 cells, in Actinians (zoo/.'). 



acotyledon (a'kotlle'don) . [Gk. a, 

 without ; kotyledon, a cup-shaped 

 hollow.] A plant without a coty- 

 ledon (hot.}. 



acquired character, a modification 

 or mutilation, due to disease or to 

 use or disuse of a special organ or 

 organs, which has actually made its 

 appearance during the lifetime of 

 the individual (biol.). 



acraspedote (akras'pgdot) a. [Gk. a, 

 without ; kraspedon, an edge or 

 border.] Having no velum (zool.). 



acrobryous (ak'robrl'us) a. [Gk. akros, 

 tip ; bryein, to swell.] Growing at 

 the tip only (dot.). 



acrocarpous (ak'rokar'pus) a. [Gk. 

 akros, tip ; karpos, fruit.] Having 

 the fructification terminating the 

 axis (bot.). 



acrocoracoid (ak'rokSr'akoid) n. [Gk. 

 akros, tip ; korax, crow ; eidos, 

 shape.] A process at the dorsal 

 end of the coracoid in birds (zoo!.). 



acrocyst (ak'roslst) n. [Gk. akros, tip ; 

 kystis, bladder.] The spherical 

 gelatinous cyst formed by the gono- 

 phore, when it projects after migra- 

 tion on the blastostyle beyond the 

 mouth of the gonotheca, for the 

 completion of the maturation of the 

 generative cells (zool.). 



acrodont (ak'rodont) a. [Gk. akros, 

 tip ; odous, tooth.] Appl. teeth 

 which are ankylosed by their base 

 to the summit of a parapet of bone 

 (anat.). 



aerodrome (ak'rodrom), acrodromous 

 (akrSd'romus) a. [Gk. akros, tip ; 

 dromein, to run.] Appl. leaf with 

 nerves converging at its point (bot.). 



acrogenous (akr6j'6nus) a. [Gk. akros, 



tip ; genos, offspring.] Increasing 

 in growth at the summit or growing 

 point (bot.). 



acromial (akro'mial) a. [Gk. akros, 

 summit ; omos, shoulder.] Pert. 

 the acromion, appl. artery, process, 

 ligament, etc. (anat.). 



acromio-clavicular (akro'mio-klavik'- 

 ular) a. [Gk. akromion, shoulder- 

 summit ; L. claviculus, dim. of 

 clavts, key.] Appl. ligaments cover- 

 ing the joint between the acromion 

 and the clavicle (anat.). 



acromion (akro'mion) n. [Gk. akros, 

 summit ; omos, shoulder.] The 

 ventral prolongation of the spina 

 scapulae (anat.}. 



acropetal (ak'ropeVal) a. [Gk. akros, 

 summit ; L. petere, to seek.] Appl. 

 leaves or flowers developing from 

 an axis so that the youngest arise 

 nearest the apex (bot.). 



acrorhagus (akrora'gus) n. [Gk. akros, 

 summit ; rhax, grape.] A tubercle 

 on the margin of certain Actinians, 

 containing nematocysts (zool.). 



acrosarc (ak'rosark) n. [Gk. akros, 

 summit ; sarx, flesh.] A pulpy 

 berry resulting from the union of 

 ovary and calyx (bot.). 



acrosome (ak'rosom) n. [Gk. akros, 

 tip ; sotna, body.] Body at the apex 

 of a spermatozoon, the apical body 

 (zool.). 



acrospire (ak'rospir) n. [Gk. akros, 

 summit ; speira, something twisted.] 

 The first shoot or sprout, being 

 spiral, at the end of a germinating 

 seed (bot.). 



acrospore (ak'rospor) n. [Gk. akros, 

 tip ; sporos, seed.] The spore at 

 the end of a sporophore (bot.). 



actinal (ak'tmal, aktfnal) a. [Gk. 

 aktis, ray.] Appl. area of an echino- 

 derm body in which the tube-feet 

 are situated ; appl. the oral area 

 with tentacles in Actinaria (zool.). 



actine (ak'tln) n. [Gk. aktis, ray.] A 

 star-shaped spicule (zool.). 



actinenchyma (ak'tlngng'kima) n. 

 [Gk. aktis, ray ; en, in ; chein, to 

 pour.] Cellular tissue having a 

 stellate appearance (bot.). 



actinoblast (aktln'oblast) n. [Gk. 

 aktis, ray ; blastos, bud.] The 

 mother-cell from which a spicule 

 is developed (zool.). 



