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There are 16 words ending with ONIN

CONIN	• CONIN n. a liquid, highly poisonous alkaloid found in hemlock, also CONIA, CONICINE, CONIINE, CONINE.
RONIN	• ronin n. A masterless samurai (who often becomes a mercenary to make ends meet). • ronin n. (Colloquial, in Japan) A student who has failed the entrance examination for the high school or university… • Ronin prop.n. A male given name originating as a coinage.
MECONIN	• meconin n. (Chemistry) A substance regarded as an anhydride of meconinic acid, found in opium. • MECONIN n. a white, fusible, neutral substance existing in opium.
OPSONIN	• opsonin n. Any chemical produced by the body, including antibodies and complement proteins, that causes a pathogen… • OPSONIN n. a substance of blood serum making bacteria vulnerable to phagocytic action.
PYRONIN	• pyronin n. Alternative form of pyronine. • PYRONIN n. either of two synthetic red xanthene dyes, also PYRONINE.
SAPONIN	• saponin n. (Organic chemistry, biochemistry) Any of various steroid glycosides found in plant tissues that dissolve… • SAPONIN n. a soapy substance obtained from plants, also SAPONINE.
THIONIN	• thionin n. Alternative form of thionine. • thionin n. (Biochemistry) Any of a class of cytotoxic polypeptides found in some plants. • THIONIN n. a violet dye, also THIONINE.
SANTONIN	• santonin n. (Chemistry) An anthelmintic found in santonica and related plants. • SANTONIN n. an anthelminthic extracted from santonica.
SYNTONIN	• syntonin n. (Obsolete, biochemistry) A form of fibrin found in muscle tissue, or produced by the action of acids on myosin. • SYNTONIN n. a substance similar to fibrin.
TROPONIN	• troponin n. (Biochemistry, medicine) A complex of three regulatory proteins that is integral to muscle contraction… • TROPONIN n. a protein of muscle.
DIGITONIN	• digitonin n. (Organic chemistry) A glycoside, obtained from Digitalis purpurea, that is used as a detergent and whose… • DIGITONIN n. a steroid saponin occurring in the leaves and seeds of foxglove.
MELATONIN	• melatonin n. A hormone, related to serotonin, that is secreted by the pineal gland, and stimulates colour change… • melatonin n. Any material similar in its chemistry and effect to the natural hormone. • MELATONIN n. a hormone secreted by the pineal gland during the hours of darkness.
SEROTONIN	• serotonin n. (Biochemistry) An indoleamine neurotransmitter, 5-hydroxytryptamine, that is involved in depression… • SEROTONIN n. a compound occurring in the brain, acting as a neurotransmitter.
CALCITONIN	• calcitonin n. (Biochemistry) A polypeptide hormone secreted by the thyroid gland that has the effect of lowering blood calcium. • calcitonin n. (Pharmacology) A synthetic or recombinant form of calcitonin used to treat Paget disease of bone and… • CALCITONIN n. a hormone secreted by the thyroid gland, controlling the rate of bone destruction.
CHAPERONIN	• chaperonin n. (Biochemistry) Any of a class of chaperone proteins.
THYROCALCITONIN	• thyrocalcitonin n. (Biochemistry) Alternative form of calcitonin. • THYROCALCITONIN n. a hormone secreted by the thyroid gland, controlling the rate of bone destruction.

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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English Wiktionary: 149 words
Scrabble in French: 2 words
Scrabble in Spanish: 1 word
Scrabble in Italian: no word
Scrabble in German: 14 words
Scrabble in Romanian: 1 word

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