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There are 15 twelve-letter words beginning with MACRO

MACROBIOTICSmacrobiotics n. The art of prolonging life.
MACROBIOTICS n. the art or science of prolonging life; a cult partly concerned with diet, foods regarded as pure being vegetable substances grown and prepared without chemicals or processing.
MACROCEPHALYmacrocephaly n. (Medicine) A condition in which the head is abnormally large.
macrocephaly n. (Geography) The excessive concentration of population and development in a single centre, to the detriment…
MACROCEPHALY n. largeness, or abnormal largeness, of the head.
MACROCLIMATEmacroclimate n. The climate of a relatively large geographic area.
MACROCLIMATE n. large-scale climate.
MACROCYTOSESmacrocytoses n. Plural of macrocytosis.
MACROCYTOSIS n. the occurrence of macrocytes in the blood.
MACROCYTOSISmacrocytosis n. The presence of macrocytes in the blood.
MACROCYTOSIS n. the occurrence of macrocytes in the blood.
MACRODACTYLSmacrodactyls n. Plural of macrodactyl.
MACRODACTYL n. one of a group of wading birds.
MACRODACTYLYmacrodactyly n. Localized gigantism in fingers or toes.
MACRODACTYLY n. the condition of being macrodactylous, having large fingers.
MACROFOSSILSmacrofossils n. Plural of macrofossil.
MACROFOSSIL n. a fossil large enough to be seen with the naked eye.
MACROGAMETESmacrogametes n. Plural of macrogamete.
MACROGAMETE n. the larger and usually female gamete of a heterogamous organism, also MEGAGAMETE.
MACROGRAPHICmacrographic adj. Of or relating to macrography.
MACROGRAPHIC adj. of or like a macrograph, a photograph, drawing, etc. in which an object appears as large as or several times larger than the original.
MACRONUCLEARmacronuclear adj. Of or pertaining to a macronucleus.
MACRONUCLEAR adj. of or like a macronucleus.
MACRONUCLEUSmacronucleus n. (Biology) The larger of the two nuclei present in ciliate protozoans; it controls the nonreproductive…
MACRONUCLEUS n. a relatively large densely staining nucleus of most ciliate protozoans that is derived from micronuclei and controls various nonreproductive functions.
MACROPHAGOUSmacrophagous adj. (Zoology) That feeds on relatively large particles or prey.
MACROPHAGOUS adj. of an animal, feeding on relatively large particles of food.
MACROPHYSICSmacrophysics n. (Physics) The branch of physics that deals with those phenomena that can be directly observed.
MACROPHYSICS n. the branch of physics concerned with macroscopic systems and objects.
MACROPTEROUSmacropterous adj. Having long wings or fins.
MACROPTEROUS adj. having large wings or fins.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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