Nouns starting with M

• megalocephaly — Noun – English ～ an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical
• megalocyte — Noun – English ～ abnormally large red blood cell (associated with pernicious anemia)
• megalohepatia — Noun – English ～ abnormal enlargement of the liver
• megalomania — Noun – English ～ a psychological state characterized by delusions of grandeur
• megalomaniac — Noun – English ～ a pathological egotist
• Megalonychidae — Noun – English ～ mammal family consisting of the two-toed sloths
• megalopolis — Noun – English ～ a very large urban complex (usually involving several cities and towns)
• Megaloptera — Noun – English ～ in some classifications considered a separate order: alderflies; dobsonflies; snake flies
• megalosaur — Noun – English ～ gigantic carnivorous bipedal dinosaur of the Jurassic or early Cretaceous in Europe
• Megalosauridae — Noun – English ～ megalosaurs
• megalosaurus — Noun – English ～ gigantic carnivorous bipedal dinosaur of the Jurassic or early Cretaceous in Europe
• megaphone — Noun – English ～ a cone-shaped acoustic device held to the mouth to intensify and direct the human voice
• megapode — Noun – English ～ large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs
• Megapodiidae — Noun – English ～ megapodes
• Megapodius — Noun – English ～ type genus of the Megapodiidae
• Megaptera — Noun – English ～ humpback whales
• megasporangium — Noun – English ～ a plant structure that produces megaspores
• megaspore — Noun – English ～ larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte
• megasporophyll — Noun – English ～ in non-flowering plants, a sporophyll that bears only megasporangia
• megathere — Noun – English ～ gigantic extinct terrestrial sloth-like mammal of the Pliocene and Pleistocene in America

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