{ . [ Gr. me`gas, gen. mega`loy, great. ] Combining forms signifying: (a) Great, extended, powerful; as, megascope, megacosm. (b) (Metric System, Elec., Mech., etc.) A million times, a million of; as, megabyte, a million butes; megawatt, a million watts; megameter, a million meters; megafarad, a million farads; megohm, a million ohms. [ 1913 Webster +PJC ]

See Meg-. [ 1913 Webster ]

prop. n. A genus of giant salamanders; in some classifications included in the genus Cryptobranchus.
Syn. -- genus Megalobatrachus. [ WordNet 1.5 ]

{ ‖, n. [ NL. megalocephalia, fr. Gr. &unr_; having a large head. ] (Med.) The condition of having an abnormally large head; called also megacephaly. -- Meg`a*lo*ce*phal"ic a. [Webster 1913 Suppl.]

n. [ Megalo- + Gr. &unr_; a hollow vessel. ] (Physiol.) A large, flattened red blood cell corpuscle having no nucleus, twice the diameter of the ordinary red corpuscle, found in considerable numbers in the blood in profound anaemia. [ 1913 Webster ]

n. [ NL., fr. megalo- + mania. ] (Pathol.) A form of mental alienation in which the patient has grandiose delusions. [ 1913 Webster ]

adj. Suffering from megalomania. [ WordNet 1.5 ]

prop. n. A natural family consisting of the two-toed sloths.
Syn. -- family Megalonychidae. [ WordNet 1.5 ]

‖n. [ NL., from Gr. me`gas, mega`lh, great + 'o`nyx claw. ] (Paleon.) An extinct quaternary mammal, of great size, allied to the sloth. [ 1913 Webster ]

a. [ Megalo- + Gr. fwnh` voice. ] Having a loud voice. [ 1913 Webster ]