MAN- 



176 



MAS- 



under surface of Medusae (zool.) ; 

 the handle-like part of the malleus 

 of the ear ; the anterior part of the 

 sternum (anat.). 



manns (ma'nus) n. [L. manus, hand.] 

 The hand, or part of the fore-limb 

 corresponding to it, as found in 

 vertebrates from Amphibia up- 

 wards (zool.~). 



manyplies, the omasus or psalte- 

 rium, the third chamber of the 

 stomach of Ruminants so-called 

 from its folded structure (zool.). 



marcescent (marses'ent) a. [L. mar- 

 cescere, to wither.] Withering but 

 not falling off; appl. a calyx or 

 corolla persisting after fertilization 

 (bot.). 



marginal (mar'jmal) a. [L. margo, 

 edge.] Pert, at or near the margin, 

 edge, or border ; appl. a form of 

 nervation (bot.) ; appl. a convolu- 

 tion of the frontal lobe (anat.). 



marginal organ or vesicle, a litho- 

 cyst (zool.). 



marginal plates, the system of 

 plates round the margin of a 

 Chelonian carapace (zool.). 



marginalia (mar'jina'lia) n. plu. [L. 

 margo, edge.] Prostalia or defen- 

 sive spicules on the body surface 

 round the osculum (zool.). 



marginate (mar'jinat) a. [L. margo, 

 edge.] Having a distinct margin 

 in structure or colouring. 



marginicidal (mar'jmisl'dal) a. [L. 

 margo, edge ; caedere, to cut.] 

 Dehiscing by line of union of 

 carpels (bot.). 



marginiform (mar'jmlform) a. [L. 

 margo, edge ; forma, shape.] Like 

 a margin or border in appearance 

 or structure. 



marginirostral (mar'jiniros'tral) a. 

 [L. margo, edge ; rostrum, beak.] 

 Forming the edges of a bird's bill 

 (zool.). 



marmorate (mar'morat) a. [L. mar- 

 mor, marble.] Of marbled appear- 

 ance. 



marrow (mar'6) n. [M.E. marow, 

 pith.] The connective tissue filling 

 up the cylindrical cavities in the 

 bodies of long bones, and the 

 spaces of the cancellous tissue, 

 differing in composition in different 

 bones. 



marsupial (marsu'pial) a. [L. marsu- 

 pium, a pouch.] Pert, a marsupium ; 

 pouch - bearing, as a kangaroo ; 

 appl. certain bones in connection 

 with the pelvic girdle in certain 

 Mammalsj 



marsupium (marsu'pium) n. [L. 

 marsupium, pouch.] Any pouch- 

 like structure in which the young 

 of an animal complete their de- 

 velopment, such as the abdominal 

 pouch of Marsupials ; the gill cavi- 

 ties of bivalves ; a recess formed 

 by diverging spines and a support- 

 ing membrane in Stelleroids ; the 

 structure protecting the acrocyst in 

 Sertularians (zool.). 



masked (mas'kd) a. [F. masque, a 

 mask.] Personate, as appl. corolla 

 (bot.). 



masseter (mase'ter) n. [Gk. masse ter, 

 one that chews.] The muscle which 

 raises the lower jaw and assists 

 in chewing (anat.). 



masseteric (mas'eter'ik) a. [Gk. 

 masseter, one that chews.] Pert. 

 or near the masseter muscle of the 

 cheek ; appl. artery, vein, nerve 

 (anat.). 



massula (mas'ula) n. [L. massa, 

 mass.] A mass of microspores in 

 a sporangium of certain Pterido- 

 phytes ; a massed group of micro- 

 spores in Orchids (bot.). 



niastax (mas'taks) n. [Gk. mas tax, 

 the mouth.] The gizzard of Rotifers 

 (zool.). 



mast cells (Mastzellen of Ehrlich), 

 spheroid or ovoid cells of soft proto- 

 plasm, very granular, numerous in 

 parts where fat is being laid down. 



mastication (mas'tika'shun) ;/. [L. 

 masttcare, to chew.] Process of 

 chewing food with the teeth till 

 reduced to small pieces or a pulp 

 (Phys.). 



masticatory stomach, the gastric 

 mill or stomodaeal apparatus of 

 Crustaceans for grinding and strain- 

 ing food material (zool.). 



mastigium (mastij'ium) n. [Gk. 

 mastigion, little whip.] A defen- 

 sive posterior lash of certain insect 

 larvae (zool.}. 



mastigobranchia (mas'tlgobrang'kla) 

 n. [Gk. mastigion, little whip ; 

 brangchia, gills.] The epipodite of 



