Nouns starting with M that are validated

• macrosporangium — Noun – English ～ a plant structure that produces megaspores
• macrospore — Noun – English ～ larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte
• Macrothelypteris — Noun – English ～ medium to large terrestrial ferns of tropical Asia to Polynesia and Australia; naturalized in Americas
• Macrotis — Noun – English ～ a genus of Peramelidae
• Macrotis lagotis — Noun – English ～ bandicoot with leathery ears like a rabbit
• Macrotus californicus — Noun – English ～ large-eared greyish bat of southern California and northwestern Mexico
• macrotus — Noun – English ～ large-eared greyish bat of southern California and northwestern Mexico
• Macrotyloma — Noun – English ～ annual or perennial vines of Africa and India and Australia; plants often placed in genus Dolichos
• Macrouridae — Noun – English ～ grenadiers
• macrozamia — Noun – English ～ any treelike cycad of the genus Macrozamia having erect trunks and pinnate leaves and large cones with sometimes edible nuts; Australia
• Macrozamia communis — Noun – English ～ large attractive palmlike evergreen cycad of New South Wales
• Macrozoarces americanus — Noun – English ～ common along northeastern coast of North America
• Macrozoarces — Noun – English ～ a genus of Zoarcidae
• Macruridae — Noun – English ～ grenadiers
• macula — Noun – English ～ a small yellowish central area of the retina that is rich in cones and that mediates clear detailed vision
• macula — Noun – English ～ a patch of skin that is discolored but not usually elevated; caused by various diseases
• macula — Noun – English ～ a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field
• macula lutea — Noun – English ～ a small yellowish central area of the retina that is rich in cones and that mediates clear detailed vision
• macular degeneration — Noun – English ～ eye disease caused by degeneration of the cells of the macula lutea and results in blurred vision; can cause blindness
• macular edema — Noun – English ～ an eye disease caused by a swelling of the macula resulting from leakage and accumulation of fluid

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