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M33—radar (written closed up, no hyphen)

Mark-IV—HAO's K-coronameter at Mauna Loa Solar Observatory, Hawaii [revised 2/00]

mass storage (adj.)

mathematical symbols—See definitions in The Science-Engineering Secretary (p. 2l2) and AIP Editorial Handbook (p. l64).

Maunder Minimum (both words capped)

measurements—Units are usually only given once, e.g., 5 to 7 km, not 5 km to 7 km. See also "metric units," Numbers.

megabyte—spell out, followed by (MB)

members' representatives—lowercase. Singular is member's representative. Members Meeting is not possessive.

Mesa Laboratory—capital M and L

mesa road—(lower case) the road leading to the Mesa Lab [2/00]

mesatop—one word, closed [2/00]

mesoscale—one word (however, meso-alpha scale, meso- beta, etc.; if necessary, meso- and microscale)

metric units—Use these alone in science articles. In most nonscience writing, give the equivalent U.S. customary/imperial unit afterward in parentheses: 100 kilometers (60 miles). At the editor's discretion, imperial may be used alone in nonscience articles. See Numbers for further discussion.

If a measurement originated in nonmetric units, e.g., cloud separation of 1,000 feet, use the original measurement first and put the metric equivalent in parentheses. If a nonmetric measurement appears in a quote, put the metric equivalent in brackets: "We went about ten miles [16 kilometers]."

In nontechnical writing, when you wish to abbreviate the names of units, treat them like any other term (see Abbreviations & Acronyms).

See Correct SI metric system usage (accessed 25 Apr. 00) for correct SI style for using metric symbols.

Mflops—megaflops; million floating-point operations per second

microscale—one word; if necessary, micro- and mesoscale

mid- —for compounds starting with "mid," first check the dictionary. If the word isn't there, do not hyphenate terms beginning with "mid" (following The Chicago Manual of Style).


Mie—initial cap.

minus—Distinguish from hyphen in typeset copy. For desktop publishing, use an en dash.

models—We now capitalize the names of computer models: Penn State/NCAR Mesoscale Model, version 5 (MM5); NCAR Community Climate Model, version 3 (CCM3). Delete "the" before acronym version: People have used CCSM to create . . . . For UQ and SN, drop "version 5" from spellout of MM5, thus: "Penn State/NCAR Mesoscale Model (MM5)." [revised 9/02]

module—title of module in italics; title of series in initial caps

money—$10 (no period or zeros needed for even dollar amounts), $10.19, 50¢ or $0.50, $3.6 million. $24K, $73M. Convert sums in foreign currency to dollars if possible. Always use dollar sign and numeral with large amounts: $2 million.

monostatic radar or acdar systems—Transmitter and receiver are located together.

month—Always spell out. See also "time."

Mount—Mount or Mt. are acceptable but preserve internal consistency: Mount Spurr, Mt. Chocorua, Mt. Elbert. (See also "Saint" and "Fort"). [revised 2/00]

Mumbai—Use this city's official name, which was changed to Mumbai in 1995. Add "India" when appropriate for clarity. Institutions that have kept Bombay in their name should follow that institution's style.

Mylar—a registered trademark

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