List of 12-letter words containing •••••

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There are 16 twelve-letter words containing 2H, M, N and 2O

HARMONICHORD	• harmonichord n. (Music) A kind of upright piano whose strings are set in vibration not by the blow of the hammer but… • HARMONICHORD n. a keyboard instrument of violin tone, in which the strings are rubbed by rosined wheels.
HARMONIPHONE	• harmoniphone n. A free-reed musical instrument played with a keyboard, in which the sounds are produced by reeds set… • HARMONIPHONE n. a keyboard wind instrument with reeds, also HARMONIPHON.
HARMONIPHONS	• harmoniphons n. Plural of harmoniphon. • HARMONIPHON n. a keyboard wind instrument with reeds, also HARMONIPHONE.
HARMONOGRAPH	• harmonograph n. A mechanical device that uses a combination of pendulums to generate an image based on Lissajous curves. • HARMONOGRAPH n. an instrument for drawing curves representing vibrations.
HOMESHORINGS	• HOMESHORING n. the transfer of service industry employment from offices to home-based employees with appropriate telephone and Internet facilities, also HOMESOURCING.
HONEYMONTHED	• HONEYMONTH v. (obsolete) to spend one's honeymoon, also HONEYMOON.
HYMENOPHORES	• hymenophores n. Plural of hymenophore. • HYMENOPHORE n. the fruiting body of some basidiomycetous fungi.
MONOPHTHONGS	• monophthongs n. Plural of monophthong. • MONOPHTHONG n. two written vowels representing a single sound, e.g. 'oo', 'oa'.
ORNITHOMORPH	• ornithomorph n. A figure in ancient art resembling a bird. • ORNITHOMORPH n. a figure or design in the form of a bird.
PHOSPHONIUMS	• phosphoniums n. Plural of phosphonium. • PHOSPHONIUM n. the radical PH4, analogous to ammonium.
PHOTOMACHINE	• PHOTOMACHINE n. a machine that prints copies of digital photographs.
PHYTOHORMONE	• phytohormone n. A plant hormone. • PHYTOHORMONE n. a plant hormone, regulating growth.
PYTHONOMORPH	• pythonomorph n. Any large extinct reptile of the taxon Pythonomorpha. • pythonomorph n. Any member of the taxon Pythonomorpha. • PYTHONOMORPH n. a large marine reptile of the Cretaceous period, with long, scaly body and paddle-shaped limbs.
RHOMBOHEDRON	• rhombohedron n. A prism with six faces, each a rhombus. • RHOMBOHEDRON n. a parallelepiped whose faces are rhombuses.
SPHYGMOPHONE	• sphygmophone n. (Physiology) An electrical instrument for determining by ear the rhythm of the pulse of a person at a distance. • SPHYGMOPHONE n. an instrument for hearing the pulse.
THERMOSIPHON	• thermosiphon n. An arrangement of siphon tubes for assisting circulation in a liquid. • THERMOSIPHON n. a method of circulating a cooling liquid through a system by using the slight difference in density between the hot and cool parts.

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 1Word.ws and WikWik.org.

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English Wiktionary: 84 words
Scrabble in French: 5 words
Scrabble in Spanish: 2 words
Scrabble in Italian: 1 word
Scrabble in German: no word
Scrabble in Romanian: 3 words

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