LAY- 



LEP- 



layer of Langhans, see cytotropho- 

 blast. 



leader (le'der) n. [A.S. laedan, to 

 lead.] Highest shoot or part of 

 trunk of a tree (bot.). 



leaf (lef) . [A.S. leaf, leaf.] An 

 expanded outgrowth of a stem, 

 usually green (bot.}. 



lechriodont (Igk'riodont') a. [Gk. 

 lechrios, slantwise ; odous, tooth.] 

 With vomerine and pterygoid teeth 

 in a row which is nearly if not quite 

 transverse (zool.). 



lecithalbumin (Igs'ithalbu'min) n. 

 [Gk. lekithos, egg-yolk ; L. albumen, 

 white of egg.] A substance, con- 

 sisting of albumin and lecithin, said 

 to exist in various organs in the 

 body (phys.). 



lecithin (leYithin) n. [Gk. lekithos, 

 egg-yolk.] A phosphorized fat of 

 cell-protoplasm (phys.). 



lecithoblast (leVithoblast) n. [Gk. 

 lekithos, egg-yolk ; blastos, bud.] 

 In developing eggs, the yolk-con- 

 taining blastomeres (smb.). 



lecithocoel (leYithosel) n. [Gk. leki- 

 thos, egg-yolk ; koilos, hollow.] The 

 segmentation cavity of holoblastic 

 eggs (emb.\ 



legume (IggunV, leg'um) n. [L. leg- 

 ume n, pulse.] A dehiscent one- 

 celled, two-valved carpel, as pod of 

 pea or bean (dot.). 



legumin (Iggu'min) n. [L. legumen, 

 pulse.] A proteid found in the 

 seeds of the Leguminosae (bot.). 



lemniscus (le"mms'kus) n. [Gk. 

 lemniskos, fillet.] One of paired 

 club-shaped organs at base of 

 the acanthocephalan proboscis 

 (zool.) ; a fillet of fibres on each side 

 of the cerebral peduncles (anat.). 



lens (16nz) n. [L. lens, lentil.] A 

 transparent part of the eye which 

 focusses rays of light on the 

 retina ; the crystalline lens (anat.); 

 the modified portion of the cornea 

 in front of each element of a 

 compound eye (zool.). 



lenticel (16n'tTs61) n. [L. lens, lentil.] 

 Ventilating pore in Angiosperm 

 stems (bot.). 



lenticular (16ntik'ular) a. [L. len- 

 ticula, dim. of lens, lentil.] Shaped 

 like a double convex lens (bot., 

 zool.). 



lenticular (Igntik'ular) n. The tip of 

 the incus articulating with the 

 stapes, which is often ossified as 

 a separate unit (anat.). 



lenticulate (16ntik'ulat) a. [L. lens, 

 lentil.] Meeting in a sharp point ; 

 depressed, circular, and frequently 

 ribbed (zool.). 



lentiform (len'tiform) a. [L. lens, 

 lentil ; forma, shape.] Lenticular. 



lentigerous (le'ntij'e'rus) a. [L. lens, 

 lentil ; gerere, to bear.] Furnished 

 with a lens (zool.). 



lentiginose (IgntTj'Inos) a. [L. lentigo, 

 from lens, lentil.] Freckled ; 

 speckled ; bearing numerous small 

 dots (zool., bot.). 



lentiginous (IgntijTnus). Lentiginose. 



lepidodendroid (lep'idode'n'droid) a. 

 [Gk. lepis, scale ; dendron, tree ; 

 eidos, like.] Pert, lepidodendron ; 

 having scale-like leaf-scars (pal.). 



lepidophyte (lep'idoflt) n. [Gk. lepis, 

 scale ; phyton, plant.] A fossil 

 plant of the fern family (pal.). 



lepidopterous (16p'Id6p't6rus) a. [Gk. 

 lepis, scale ; pteron, wing.] Pert. 

 the Lepidoptera, i.e. having wings 

 covered with minute over-lapping 

 scales (zool.). 



lepidote (Igp'Idot) a. [Gk. lepis, scale.] 

 Covered with minute scales (bot.). 



lepidotic (lep'IdSt'lk) a. [Gk. lepis, 

 scale.] Appl. an acid found in 

 wings of some Lepidoptera (phys.). 



lepidotrichia (Igp'idotrik'ia) n. plu. 

 [Gk. lepis, scale ; thrir, hair.] In 

 Teleostomi, bony dermal fin-rays, 

 probably modified scales (zool.). 



lepospondylous (Igp'ospon'dllus) a. 

 [Gk. lepos, husk ; sphondylvs, 

 vertebra.] Having amphicoelous, 

 or hour-glass shaped, vertebrae 

 (zool.). 



leptocephaloid (16p't6k6f'aloid, -s6f-) 

 a. [Gk. leptos, slender ; kephale, 

 head ; eidos, resemblance.] Re- 

 sembling or having the shape of 

 a Leptocephalus (zool.). 



leptocercal (Igp'tosgr'kal) a. [Gk. 

 leptos, slender; kerkos, tail.] With 

 long slender tapering tail, as some 

 Fishes (zool.). 



leptodactylous (lep'todak'tilus) a. 

 [Gk. leptos, slender; daktylos, 

 finger.] Having small or slender 

 digits (zool.). 



