ACC- 



ACI- 



to go to.] Additional or accom- 

 panying. 



accessory bud, an additional axillary 

 bud (bot.). 



accessory chromosome, a chromo- 

 some found in the sex-cells of various 

 animals which by its peculiar be- 

 haviour and the stage it appears at, 

 is considered by some authorities 

 to be the factor that determines sex. 



accessory nerve, the eleventh cranial 

 nerve (anat.). 



accessory pancreatic duct, Santo- 

 rini's duct (anat.). 



accommodation (akomoda'shun) n. 

 [L. ad, to ; commodus, fitting.] The 

 adjustment of the eye for receiving 

 clear images of objects at different 

 distances (phys.). 



accrescent (akres'ent) a. [L. accre- 

 scere, to increase.] Appl. plants that 

 continue to grow after flowering, or 

 calyx continuing to grow after pol- 

 lination (bot.). 



accretion (akre'shun) n. [L. accre- 

 scere, to increase.] Growth by the 

 external addition of new matter ; in 

 protozoology, agglomeration (biol.). 



accumbent (akum'bent) a. [L. ac- 

 cumbere, to lie on.] Appl. embryo 

 having cotyledons with their edges 

 turned towards the radicle, as in 

 Cruciferae (bot.). 



acentrous (asen'trus) a. [L. a, with- 

 out ; centrum, centre.] With no 

 vertebral centra and with per- 

 sistent notochord, as in certain 

 fishes (zoo/.). 



acephalous (akef'alus, -sef-) a. [Gk. 

 a, not ; kephale, head.] Having no 

 structure comparable to the head, 

 as in some molluscs (zool.). 



acerate (as'grat) a. [L. acer, sharp.] 

 Needle-shaped ; pointed at one end, 

 appl. monaxon or oxeote spicules 

 (zool.). 



acerose (as'eros) a. [L. acer, sharp.] 

 Narrow and slender, with a sharp 

 point ; as a pine-leaf (bot.). 



acervuline (aseYviilin) a. [L. acervus, 

 heap.] Irregularly heaped to- 

 gether, appl. foraminiferal tests 

 (zool.). 



acervulus (aser'vulus) n. [LL. dim. 

 of acervus, heap.] A small heap 

 or cluster ; especially of sporo- 

 genous mycelium (bot.). 



acervulus cerebri, minute grains of 

 a calcareous nature in the pineal 

 gland, etc., of the brain (anat.). 



acetabulum (asgtab'ulum) n. [L. 

 acetabulum, vinegar - cup.] The 

 socket for the head of the femur, 



situated at the junction of the 

 ilium, ischium, and pubis, all of 

 which may or may not take part in 

 its formation (anat.) ; in insects, 

 the cavity of the thorax formed by 

 the epimeron, sternum, and occa- 

 sionally epigastrium, in which the 

 legs are inserted ; the large pos- 

 terior sucker in leeches ; one of 

 the cotyledons of the ruminant 

 placenta ; the sucker on the arms 

 of a Cephalopod (sool.). 



acheilary (akl'lan) a. [Gk. a, with- 

 out ; cheilos, lip.] Having the 

 labellum undeveloped, as in some 

 orchids (bot.). 



achene (aken') . [Gk. a, not ; 

 chainein, to gape.] A monosper- 

 mal seed-vessel which does not 

 open or crack (bot.). 



Achillis tendo (Skills ten'do) n. 

 [Achilles, hero of the Iliad, who 

 had a vulnerable heel ; L. tendo, 

 tendon.] The hamstring ; the 

 united strong tendon of the gastro- 

 cnemiusand solaeus muscles (anat.). 



achlamydeous (ak'lamid'eus) a. [Gk. 

 a, without; chlamys, cloak.] Having 

 neither calyx nor corolla (bot.). 



achromatin (akro'matin) n. [Gk. , 

 without ; chroma, colour.] The 

 non-staining ground substance and 

 linin of the nucleus (cyt.). 



achromatinic (akro'matin'ik) a. [Gk. 

 a, without ; chroma, colour.] Pert. 

 achromatin, or resembling achro- 

 matin in its properties (cyt.). 



acicular (aslk'ular) a. [L. acicula, 

 small needle.] Like a needle in 

 shape ; sharp-pointed (bot.). 



aciculum (aslk'ulum) n. [L. acicula, 

 small needle.] One of the stiff 

 basal setae in the parapodium of 

 a worm (zool.). 



acinaciform (aslnas'iform) a. [L. 

 acinaces, short sword ; forma, 

 shape.] Shaped like a sabre or 

 scimitar ; appl. leaf (bot.). 



acinarious (aslna'rlus) a. [L. acinus, 

 berry.] Having globose vesicles, 

 as some Algae (bot.). 



