
1) An organon 2) Medieval music 3) Polyphonic voice part
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https://www.crosswordclues.com/clue/organum

Latin, meaning: instrument, musical instrument.
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http://archives.nd.edu/ooo.htm

Organum (əm) is, in general, a plainchant melody with at least one added voice to enhance the harmony, developed in the Middle Ages. Depending on the mode and form of the chant, a supporting bass line (or bourdon) may be sung on the same text, the melody may be followed in parallel motion (parallel organum), or a combination of both of these tech...
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http://en.wikipedia.org/wiki/Organum
[instrument] An organum is any one of a number of musical instruments which were the forerunners of the organ. The name comes from the Latin organum, meaning any tool in general or any musical instrument in particular (or an organ of the body), which in turn came from the Greek organon, with similar meanings, itself derived from ergon and s...
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http://en.wikipedia.org/wiki/Organum_(instrument)

• (n.) An organ or instrument; hence, a method by which philosophical or scientific investigation may be conducted; -- a term adopted from the Aristotelian writers by Lord Bacon, as the title (`Novum Organon`) of part of his treatise on philosophical method.
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http://thinkexist.com/dictionary/meaning/organum/

originally, any musical instrument (later in particular an organ); the term attained its lasting sense, however, during the Middle Ages in reference ... [10 related articles]
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http://www.britannica.com/eb/a-z/o/29

Synonym: organ, organ. ... Origin: L. Tool, instrument ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

(or´gә-nәm) Latin word meaning organ; a term used in anatomy.
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http://www.encyclo.co.uk/local/21001

A water-powered organ.
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http://www.encyclo.co.uk/visitor-contributions.php

Type: Term Pronunciation: ōr′gă-nŭm, ōr′gă-nă Synonyms: organ, organ
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http://www.medilexicon.com/medicaldictionary.php?t=63296

organum (singular); organa (plural) An organ: a somewhat independent part of the body that is arranged according to a characteristic structural plan, and performs a special function or functions. It is composed of various tissues, one that is primary in function. Also called organon.
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http://www.wordinfo.info/words/index/info/view_unit/1505/3

a polyphonic composition based on plainchant. In organum, a new line (the vox organalis) is added to the original plainchant line (the vox principalis) and uses the same text as the original. In settings of organum, sections of a chant that were originally sung by the choir remain as plainchant, so an alternation of polyphony and monophony results....
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https://www.arlima.net/the-orb/encyclop/culture/music/orbgloss.htm

(Latin) a musical instrument.
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https://www.encyclo.co.uk/local/10135

an organon. · · the doubling, or simultaneous singing, of a melody at an interval of either a fourth, a fifth, or an octave. · the second part in such singing.
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https://www.infoplease.com/dictionary/organum
No exact match found.