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There are 7 seven-letter words containing IGEN

ANTIGEN• antigen n. (Immunology) A substance that induces an immune response, usually foreign.
• ANTIGEN n. a substance that stimulates the production of antibodies, also ANTIGENE.
BIGENER• BIGENER n. (Latin) a hybrid between genera.
EPIGENE• epigene adj. (Crystallography) Foreign; unusual; not natural to the substance in which it was found.
• epigene adj. (Mineralogy) Of or pertaining to the region just below the surface of the earth.
• EPIGENE adj. taking place near the earth's surface.
EXIGENT• exigent adj. Urgent; pressing; needing immediate action.
• exigent adj. Demanding; requiring great effort.
• exigent n. (Archaic) Extremity; end; limit; pressing urgency.
INDIGEN• indigen n. An indigene or native.
• indigen n. (Botany) A plant known to be indigenous to a region, rather than a cultigen.
• INDIGEN n. one born in a country; an aboriginal animal or plant, also INDIGENE.
LUCIGEN• lucigen n. (Historical) A kind of oil lamp using compressed air.
• LUCIGEN n. a lamp burning oil mixed with air in a spray.
MUCIGEN• mucigen n. (Physiology) A substance formed in mucous epithelial cells that gives rise to mucin.
• MUCIGEN n. a substance secreted by the cells of mucus membrane, also MUCINOGEN.

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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