ABO- 



ACC- 



mature birth.] To be arrested in 

 development ; to be born prema- 

 turely (biol.) 



abortion (abor'shun) n. [L. abortus, 

 premature birth.] Premature birth ; 

 arrest of development of an organ 



abranchiate (abrang'kiat) a. [Gk. a, 

 without ; brangchia, gills.] Without 

 gills (zool.). 



abrupt (abrupt') a. [L. ab, from ; rum- 

 pere, to break.] Appearing as if 

 broken, or cut off, at the extremity. 

 abruptly-acuminate, having a.broad 

 extremity, as a leaf, from which a 

 point arises (hot.). 



abruptly-pinnate, having the main 

 axis of the epipodium not winged, 

 but bearing a number of secondary 

 axes which are winged (bot.). 

 absciss (ab'sls) a. [L. abscindere, to 

 cut off.] Appl. layer of cells just 

 outside the cork-layer, to whose 

 disorganization the fall of the leaf 

 is due (bot). 



abscission (absish'un) n. [L. abscin- 

 dere, to cut off.] The separation 

 of parts (dot.). 



absorption (absorp'shun) n. [L. 

 absorbere, to suck in.] The intus- 

 susception of fluid by living cells 

 or tissues ; the passage of nutritive 

 material through living cells (biol., 

 phys.). 



abstriction (abstrik'shun) n. [L. 

 abstringere, to cut off.] The pro- 

 cess of detaching spores (conidia) 

 by the rounding off of the tips of 

 the sporophores, as in mildews (bot.). 

 abterininal (abter'mmal) a. [L. ab, 

 from ; terminus, end.] Going from 

 the end inwards (phys.). 

 abysmal (abiz'mal) a. [Gk. abysses, 

 bottomless.] Pert, depths of the 

 ocean. 



abyssal (abis'al) a. [Gk. abysses, 

 bottomless.] Pert, depths of the 

 ocean ; appl. organisms or material 

 usually found there (biol.). 

 acanaceous (akana'shus) a. [Gk. 

 akanos, thorn.] Bearing thorns or 

 prickles, as leaves (bot.). 

 acantha (akan'tha) n. [Gk. akantha, 

 thorn.] Prickle (bot.) ; spinous 

 process (zool). 



acanthaceous (akantha'shus) a. [Gk. 

 akantha, thorn.] Bearing prickles. 



acanthin (akan'thin) n. [Gk. akantha, 

 thorn.] A substance like chitin, 

 strontium sulphate, forming the 

 skeleton of the Radiolarians (phys.). 

 acanthion (akan'thion) n. [Gk. akan- 

 tha, thorn.] The most prominent 

 point on the nasal spine (anat.). 

 acanthocarpous (akan'thokar'pus) a. 

 [Gk. akantha, thorn ; karpos, fruit.] 

 Having the fruit covered with spines 

 or prickles. 



acanthocephalous (akan'thokef'alus, 

 -sef-) a. [Gk. akantha, thorn ; keph- 

 ale, head.] With a hooked pro- 

 boscis (zool.). 



acanthocladous (akan'thoklad'us) a. 

 [Gk. akantha, thorn ; klados, branch.] 

 Having spiny branches, 

 acanthocyst (akan'thosist) n. [Gk. 

 akantha, thorn ; kystis, bladder.] 

 A sac containing lateral or reserve 

 stylets in Nemerteans (zool.). 

 acanthophore (akan'thofor) n. [Gk. 

 akantha, thorn ; pherein, to bear.] 

 A conical mass, the basis of the 

 median stylet in Nemerteans (zool.). 

 acanthosphenote (akan'thosfe'not) a. 

 [Gk. akantha, thorn ; sphen, wedge.] 

 Appl. an echinoid spine made up of 

 solid wedges separated by porous 

 tissue (zool.). 



acanthozooid (akan'thozo'oid) n. [Gk. 



akantha, thorn ; soon, animal ; eidos, 



form.] The tail part of the pro- 



scolex of Cestodes as distinguished 



from the body or cystozooid (zool.). 



acapnia (akap'nia) n. [Gk. akapnos, 



without smoke.] Diminution or 



want of carbon dioxide (phys.). 



acaulescent (akoles'ent) a. [Gk. a, 



without ; kaulos, stalk.] Having a 



shortened stem (bot.). 



accelerator (aksgl'erator) n. [L. ac- 



celerare, to hasten.] Appl. muscle 



or nerve which increases the rate 



of action (phys.). 



acceptor (aksep'tor) n. [L. accipere, 

 to accept.] A body or substance 

 which receives and unites with 

 another substance or gas intro- 

 duced (phys.). 



accessorius (akseso'rius) n. [L. ac- 

 cedere, to go to.] A muscle aiding 

 in the action of another ; the spinal 

 accessory or eleventh cranial nerve 

 (anat.). 

 accessory (akseVori) a. [L. accedere, 



