noun. 
                    An abbreviation of the Latin Medicinæ Doctor, Doctor of Medicine (see doctor, 2); in musical notation, of mano destra (Italian) or main droite (French), ‘right hand,’ indicating a passage to be performed by the right hand.
                  
                
                  
                    noun. 
                    An abbreviation of Middle Dutch;
                  
                
                  
                    noun. 
                    of months (after) date.
                  
                
                  
                    noun. 
                    An abbreviation
                  
                
                  
                    noun. 
                    of Latin Musicæ Graduatus. Graduate of Music.
                  
                
                  
                    
                    An abbreviation
                  
                
                  
                    
                    of Master of Laws;
                  
                
                  
                    
                    of Master of Literature;
                  
                
                  
                    
                    of muzzle-loading.
                  
                
                  
                    noun. 
                    An abbreviation of Master of Science;
                  
                
                  
                    noun. 
                    of Master of Surgery;
                  
                
                  
                    noun. 
                    of month's sight;
                  
                
                  
                    noun. 
                    of Latin Memoriæ Sacrum, sacred to the memory (of, etc.).
                  
                
                  
                    
                    An abbreviation of Methodist Episcopal; of Mining Engineer: as, John Smith, M. E.; of Middle English: used (as Middle English) in the etymologies of this work.
                  
                
                  
                    noun. 
                    An abbreviation of Maelzel's metronome. See metronome.
                  
                
                  
                    noun. 
                    An abbreviation of the Latin Medicinæ Baccalaureus, Bachelor of Medicine;
                  
                
                  
                    noun. 
                    of the Latin Musicæ Baccalaureus, Bachelor of Music;
                  
                
                  
                    noun. 
                    of “mark of the beast,” in allusion to the popular belief that the garment described below smacked of popery.
                  
                
                  
                    
                    As a symbol:
                  
                
                  
                    
                    M denotes magnetic moment: usually printed in old English; a gaseous pressure of the millionth of an atmosphere.
                  
                
                  
                    
                    μ denotes magnetic permeability or the specific conductivity of any substance for lines of magnetic force; the coefficient of friction.
                  
                
                  
                    
                    m stands for the intensity or strength of a magnetic pole.
                  
                
                  
                    
                    m stands for square meters, m for cubic meters.
                  
                
                  
                    
                    As an abbreviation:
                  
                
                  
                    
                    In titles, M. stands also for Marquis, Matthew (a book of the New Testament), and Monsieur.
                  
                
                  
                    
                    In a ship's log-book, masculine is an abbreviation of moderate.
                  
                
                  
                    
                    In a chart, masculine stands for mud; in meteorology, for mist; in ophthalmol., for myopia.
                  
                
                  
                    
                    In pharmacy, M. or masculine stands for macerare (macerate), manipulus (a handful), mensura (measure or by measure), minimum (minim), misce (mix), mistura (mixture).
                  
                
                  
                    
                    In astronomical tables, M. or masculine (abbreviation of L. meridies) indicates meridian or meridional: 12 M. stands for noon. See A. M. and P. M.
                  
                
                  
                    
                    In astronomy, M. stands for Messier, referring to his catalogue of 103 nebulæ and star-clusters: thus, 51M. or M.51 is the famous whirlpool nebula.
                  
                
                  
                    
                    M. stands for Monday; M. or masculine, for mile or miles, mill or mills, month or months, moon, muster; m., for married, masculine, middle, minutes, morning, and the Latin mille (a thousand).
                  
                
                  
                    noun. 
                    An abbreviation of Master of the Rolls.
                  
                
                  
                    noun. 
                    An abbreviation of mean time.
                  
                
                  
                    noun. 
                    See A. M. .
                  
                
                  
                    noun. 
                    An abbreviation of Member of Congress.
                  
                
                  
                    
                    An abbreviation of Major-General.
                  
                
                  
                    
                    In musical notation, an abbreviation of the French main gauche (left hand), indicating that a note or passage is to be played with the left hand.
                  
                
                  
                    noun. 
                    An abbreviation of Member of Parliament.
                  
                
                  
                    noun. 
                    An abbreviation of the Latin Magister Chirurgiæ, Master of Surgery;