EXA- 



100 



EXO- 



vere, to unroll.] The gradual de- 

 velopment of organisms from pre- 

 existing organisms (biol.). 



exalate (gksa'lat) a. [L. ex, without ; 

 ala, wing.] Not having wing-like 

 appendages (bot.). 



exalbuminous (gk'salbu'minus) a. [L. 

 ex, without ; albumen, white of egg.] 

 Without albumen ; appl. seeds with- 

 out endosperm or perisperm, or 

 both (dot.). 



exannulate (eksan'ulat) a. [L. ex, 

 without ; annulus, ring.] Having 

 a sporangium not furnished with 

 an annulus or ring ; appl. certain 

 ferns (bot.). 



exarch (ek'sark) n. [L. ex, without ; 

 Gk. arche, beginning.] With the 

 protoxylem strands in touch with 

 the pericycle (dot.). 



exasperate (eksas'perat, egzas'perat) 

 a. [L. ex, without ; asperare, to 

 make rough.] Furnished with hard, 

 stiff points (hot.). 



excentric (eksen'trik) a. [L. ex, 

 without ; centrum, centre.] One- 

 sided ; having the two portions of 

 the lamina unequally developed 

 (bot.). 



exciple (gk'sipl) n. [L. excipula, re- 

 ceptacles.] Theouter covering of the 

 apothecium in certain Lichens (dot.). 



excitation (ek'sita'shun) n. [L. ex, 

 out ; citare, to rouse.] The act of 

 producing or increasing the stimu- 

 lation ; the stimulation thus pro- 

 duced (phys.). 



excitatory cells, motor cells in the 

 sympathetic nervous system (phys.). 



excite (ekslt') v. [L. ex, out ; citare, 

 to rouse.] To start or increase the 

 vital activities of an organism or 

 part thereof (phys.). 



excitonutrient (eksi'tonu'trient) a. 

 [L. ex, out ; citare, to rouse ; 

 nutriens, feeding.] Causing or in- 

 creasing the nutrient activities 

 (phys.). 



exclusion (ekskloo'zhun) n. [L. ex- 

 cludere, to exclude.] Act of expel- 

 ling, or the product of the expulsion 

 (phys.). 



exconjugant (ekskon'joogant) n. [L. 

 ex, out ; conjugare, to yoke.] An 

 organism which is leading an inde- 

 pendent life after conjugation with 

 another (zool.). 



excreta (gkskre'ta) n. plu. [L. ex- 

 cretum, separated.] Waste material 

 eliminated from the body or any 

 tissue thereof (phys.) ; deleterious 

 substances formed within a plant 

 (bot.). 



excrete (ekskret') v. [L. ex, out ; 

 cernere, to sift.] To eliminate waste 

 material from the body (phys.) ; to 

 withdraw useless materials from the 

 place of most active metabolism in 

 the plant (hot.). 



excretion (ekskre'shun) n. [L. ex, 

 out ; cernere, to sift.] Act of elimi- 

 nating waste material, or the pro- 

 duct of the elimination (phys.). 



excurrent (ekskur'e'nt) a. [L. ex, 

 out ; currere, to run.] Pert, ducts, 

 channels, or canals in which there 

 is an outgoing flow (zool.) ; with 

 undivided main stem ; having the 

 midrib projecting beyond the apex 

 (bot.). 



excurved (ekskurvd') a. [L. ex, out ; 

 curvare, to curve.] Curved out- 

 wards from the centre (zool.}. 



exfoliation (gksfo'lia'shun) n. [L. 

 ex, out \folium, leaf.] The shedding 

 of the leaves or scales from a bud 

 (bot.). 



exhalent (eksha'lfint) a. [L. ex, out ; 

 halare, to breathe.] Capable of 

 carrying from the interior outwards 

 (zool.). 



exindusiate (ek'slndu'zlat) a. [L. ex, 

 out ; indusium, cover.] Having 

 the sporangia uncovered or naked 

 (bot.). 



exine (ek'sm), see extine. 



exinguinal (eVsm'gwInal) a. [L. ex, 

 out ; inguen, groin.] Occurring 

 outside the groin ; pert, second 

 joint of an arachnid leg (zool.). 



exites (ekslts') n. plu. [Gk. exo, 

 without.] Offshoots on the outer 

 lateral border of the axis of certain 

 arthropod limbs (zool.}. 



exocardiac (ek'sokar'diak) a. [Gk. 

 exo, without ; kardia, heart.] Situ- 

 ated outside the heart (zool.). 



exocarp (ek'sokarp) n. [Gk. exo, 

 without ; karpos, fruit.] The outer 

 layer of the pericarp (bot.). 



exoccipital (ek'sokslp'ftal) a. [L. ex, 

 without ; occiput, back of head.] 

 Pert, a bone on each side of the 

 foramen magnum (goal.). 



