• 



L. The abbreviation of Left, of Lumbar, of Lithium, 

 and of Libra, a pound. 



/. denotes wave-length. For instance a 506, means a 

 e-length equal to 506 millionths of a millimeter. 

 - :netimes the letters W. L. are used instead of/.. 



Lb. Contraction of liber = pound. 



Lab, or Lab-ferment. The ferment of rennet pro- 

 ducing coagulation of milk. It is separated from the 

 proenzyme, labzymogen, by means of the acids of the 

 ric juice , and especially by HC1. Labzymogen 

 resists the action of alkalies, which, even in very 



«iall amounts, destroys the lab. A temperature of 35 

 40 C. is most favorable to the action of lab. At 

 C. the lab is destroyed, but not the labzymogen. 

 aoarraque's Liquor. See Liquor. L.'s Solution. 

 See Chlorin. 



Labbe, Vein of. See Vein. 



Labdacism (lab'-das-izm). Same as Lambdacism. 



Labdanum (lab'-dan-um). See Ladanum. 



Labellum (la-bel'-um) [dim. of labium, a lip: //. , 

 Labella\ In biology : (a) One of the petals of an 

 orchid, which, properly the upper one, is made the 

 lower by a semi-twist of the ovary. It is larger than the 

 other petals and offers a landing-place for insects ; it 

 is carried backward in the form of a spur, and then 

 assumes the functions of a nectary and so attracts 

 visitors (Cheshire) ; (b) One of the mouth-parts of an 

 insect. 



Labes (la'-bez) [L.]. An old name for the plague ; 

 also, for any depravation or lowering of the standard 

 of health. 



Labial (la'-be-al) [labium, a lip]. Pertaining to the 

 lips. L. Bone. See Intermaxillary. L. Frenum, 

 frenum of the lips. 



Labialism {la' ' -be-al-izm) [labium, a lip]. The ten- 

 dency to pronounce any articulate sounds as if they 

 were labials ; the addition of a labial or labiodental 

 quality to an articulate sound. 



Labials (la'-be-alz) [labium, a lip]. The consonant- 

 sounds ; they are formed mainly by the rips. See 

 Consonants. 



Labiate (la'-be-at) [labium, a lip]- In biology, 

 lipped. Shaped like, or functioning as, a lip. L. 

 nts, the Labiata, or mintworts ; an order of 

 re-stemmed plants, mostly herbs, with aromatic 

 perties, many of the species being highly charged 

 with volatile oils. 



Labiatiform (la-be-at'-if-orm). See Labiate. 



Labidometer (lab-id-om' -et-er) p.a/3/c, forceps ; fdrpov, 

 a measure]. A forceps used in measuring the dimen- 

 sions of the head of a fetus in the pelvis. 



Labidophorous (lab-id-off'-or-us) [/-a/3/c, forceps; 

 Qopk, bearing]. Applied to insects having organs 

 resembling pinchers. 



Labidoprion (lab-id-o* -pre-on) [/m3ic, forceps ; np'uw, 

 saw]. A forceps-saw. 



Labiella i!a-be-el'-ah ) [labium, a lip]. In biology, a 

 minute, rounded, median portion of the deutomala in 

 mynapods ; it corresponds in a degree to the lingua 

 of hexapods (Packard). 



Labile (lab'-il) [labilis ; labi, to glide]. 1. In electro- 

 therapeutics a labile application is the passing of the 

 electrode — usually the negative — along and touching 

 the skin over the track of a nerve. 2. Deciduous. 

 : Labimeter (lab -im' -et-er). Same as Labidometer. 



Labio-alveolar (la' -be-o-al-ve' -o-lar) [labium, lip; 

 alveolus, a small hollow] . Pertaining to the lip and 

 to one or more dental alveoli. 



649 LABOR 



Labio-chorea (la' -be-o-ko-re f -ah ) [labium, lip ; x°P eia ' 

 dancing]. A choreic affection of the lips, and the 

 stammering that results from it. 



Labio-choreic (la' ' -be-o-ko-re' '-ik ) [labium, lip ; x°P £ ^ a t 

 dancing]. Relating to lip-stammering. 



Labio-dental (la' -be-o-den' -tal') [labium, lip ; dens, a 

 tooth]. Pertaining to the lips and the teeth. 



Labio-glosso-laryngeal (la' '-be-o-glos' '-o-lar-in' 'je-al) 

 [labium, lip; y'/ucoa, tongue; 16pvyg, larynx]. Per- 

 taining conjointly to lips, tongue, and larynx. L. 

 Paralysis. See Bulbar Paralysis. 



Labio-glosso-pharyngeal (la' -be-o-glos' -o-far-in' -je- 

 al) [labium, lip; -//.iaaa, tongue ; odpv-^, pharynx]. 

 Pertaining conjointly to lips, tongue, and pharynx. 



Labiomancy (la f -be-o-man-se) [labium, lip ; uavreia, 

 divination]. The power of understanding what is 

 said by observing the motions of the lips in speech. 



Labio-mental (la'-be-o-men'-tal) [labium, lip; men- 

 turn, chin]. Relating to lip and chin. 



Labio-nasal (la' -be-o-na' -sal) [labium, lip; nasus, 

 nose] . Labial and nasal ; pertaining to lip and nose. 



Labio-palatine (la' -be-o-pal' -at-in) [labium, lip ; pala- 

 tum, palate]. Relating to lip and palate in common. 



Labioplastic (la-be-o-plas'-tik) [labium, lip ; —'/.aooeiv, 

 to form] . Pertaining to an operation for restoring the 

 lip, after injury or partial destruction of the same ; 

 chiloplastic. 



Labiose (la'-be-os) [labium, lip]. In biology, resem- 

 bling a true labiate flower. 



Labiotenaculum (la-be-o-ten-ak' -u-lum) [labium, lip ; 

 tenaculum, a holder]. An instrument for holding the 

 lips in a position required for examination or opera- 

 tion. 



Labipalp (la' -be-palp)[labium, a lip ; palpare, to stroke, 

 to feel]. In biology, a labial palp or feeler. 



Labitome (lab'-it-dm) [/.a^c, forceps; tout/, cutting]. 

 Cutting-forceps. 



Labium (la'-be-um) [L. ://. , Labia]. A lip. Also, 

 any structure consisting of a strip or flap of elastic tis- 

 sue that closes upon an orifice. In biology, applied 

 to various lip-like structures in animals and plants, 

 usually the lower when two are present, the upper 

 being called the labrum. L. austriacum, Austrian 

 lip ; the thick, pendent upper lip of the Austrian reign- 

 ing family. L. cerebri, the margins of the cerebral 

 hemispheres that overlap the corpus callosum. L. 

 duplex, a congenital longitudinal duplication of 

 the mucosa of the upper, and rarely of the lower 

 lip. L. externus pudciidi. See L. majus. L. 

 internus pudendi. See L. minus. L. leopoldi- 

 num, a thick, pendent lower lip; named after Em- 

 peror Leopold. L. leporinum. See Hare-lip. L. 

 majus, or L. pudendi majus, one of two folds of 

 skin of the female external genital organs, arising 

 just below the mons veneris, surrounding the vulval 

 entrance, and meeting at the anterior part of the perin- 

 eum. L. minus, L. pudendi minus, or nympha, 

 one of two folds of mucous membrane at the inner 

 surfaces of the labia majora. L. tympanicum, the 

 portion of the lamina spiralis forming the lower border 

 of the sulcus spiralis. L. urethrae, the lateral margins 

 of the external urinary meatus. L. vestibulare. the 

 overhanging extremity of the lamina spiralis that forms 

 the upper part of the sulcus spiralis. 



Labor (la'-bor) [L.]. Work. Parturition; bringing 

 forth young. That natural process by which a preg- 

 nant woman expels the product of conception at 

 the expiration of the period of pregnancy, normally, 



