No exact matches for mel, but the following may be helpful.

melamine noun, chem 1 a white crystalline organic compound used to form artificial resins (melamine resins) that are resistant to heat, water and many chemicals. 2 one of these resins. 3 material made from one of these resins, widely used as laminated coatings.
ETYMOLOGY: 19c: from German Melamin.

melancholia noun (melancholiae) old use mental depression.
ETYMOLOGY: 17c: Latin; see melancholy.

melancholy noun (melancholies) 1 a tendency to be gloomy or depressed. 2 prolonged sadness. 3 a sad, pensive state of mind. adj sad; causing or expressing sadness. melancholic adj relating to or suffering from melancholia or melancholy. See also humour noun 6.
ETYMOLOGY: 14c: from Greek melancholia, from melan black + chole bile, because the condition was once thought to be due to an excess of black bile in the body.

Melanesian adj belonging or relating to Melanesia, a group of islands NE of Australia, its inhabitants or their languages. noun 1 a citizen or inhabitant of, or person born in, Melanesia. 2 a group of languages spoken in Melanesia, or one of these languages.
ETYMOLOGY: 19c: from melano- (because the dominant race in these islands is dark-skinned), modelled on Polynesian.

melange or mélange noun (melanges or mélanges) a mixture, especially a varied or confused one • a melange of strange characters • a melange of winter vegetables.
ETYMOLOGY: 17c: French.

melanin noun, physiol, chem the black or dark brown pigment found to varying degrees in the skin, hair and eyes of humans and animals.
ETYMOLOGY: 19c.

melano- or (before a vowel) melan- combining form, denoting 1 black or dark. 2 melanin.
ETYMOLOGY: From Greek melas, melanos black.

melanocyte noun (melanocytes) zool a cell that produces melanin.
ETYMOLOGY: 19c.

melanoma noun (melanomas, melanomata) medicine a cancerous tumour, usually of the skin, that is composed of melanocytes and may spread to other parts of the body, such as the lymph nodes.
ETYMOLOGY: 19c: Latin.

melatonin noun, physiol in vertebrates: a hormone secreted by the pineal gland that is involved in the control of certain daily and seasonal changes, and changes in pigmentation.
ETYMOLOGY: 1950s: modelled on serotonin, from Greek melas black.

Melba toast noun very thin, crisp toast. See also peach melba.
ETYMOLOGY: 1930s: named after Dame Nellie Melba (1861-1931), the Australian operatic soprano.

meld¹verb (melded, melding) tr & intr to merge, blend or combine.
ETYMOLOGY: 1930s.

meld² verb (melded, melding) tr & intr, cards to declare; to lay down (cards) in order to score points. noun a laying down of cards.
ETYMOLOGY: 19c: from German melden, related to Anglo-Saxon meldian to show forth or make known.

melee or mêlée noun (melees or mêlées) 1 a riotous brawl involving large numbers of people. 2 any confused or muddled collection.
ETYMOLOGY: 17c: French mêlée, from mêler to mix.

meliorate verb (meliorated, meliorating) tr & intr to improve. See also ameliorate. melioration noun. meliorative adj.
ETYMOLOGY: 16c: from Latin meliorare, from melior better.

mellifluous or mellifluent adj said of sounds, speech, etc: having a smooth sweet flowing quality. mellifluously or mellifluently adverb. mellifluousness noun.
ETYMOLOGY: 15c: from Latin mel honey + fluere to flow.

mellow adj (mellower, mellowest) 1 said of a person or their character: calm and relaxed with age or experience. 2 said of sound, colour, light, etc: soft, rich and pure. 3 said of wine, cheese, etc: fully flavoured with age; well matured. 4 said of fruit: sweet and ripe. 5 said of a person: pleasantly relaxed or warm-hearted through being slightly drunk or affected by a recreational drug. verb (mellowed, mellowing) tr & intr to make or become mellow. mellowness noun.
ETYMOLOGY: 15c: perhaps from Anglo-Saxon mearu soft or tender.

melodeon or melodion noun 1 a small reed-organ; a harmonium. 2 a kind of accordion.
ETYMOLOGY: 19c: German Melodion, from Melodie melody.

melodic adj 1 relating or belonging to melody. 2 pleasant-sounding; tuneful; melodious. melodically adverb.
ETYMOLOGY: 19c.

melodious adj 1 pleasant to listen to; tuneful. 2 having a recognizable melody. melodiousness noun.
ETYMOLOGY: 14c.

melodist noun 1 someone who composes melodies. 2 rather dated a singer.
ETYMOLOGY: 18c in sense 2.

melodrama noun (melodramas) 1 as a theatrical genre especially popular during the 19c: drama often including musical items and featuring simplified characters, sensational events and traditional justice, usually in the form of a happy ending. 2 a play or film of this kind, sometimes lacking the musical element and with an emphasis on appealing to the emotions. 3 derog excessively dramatic behaviour. melodramatic adj excessively emotional, sensational, etc; overstrained, characteristic of melodramas • stop being so melodramatic. melodramatically adverb. melodramatics plural noun melodramatic behaviour. melodramatize or melodramatise verb.
ETYMOLOGY: 19c: from French mélodrame, from Greek melos song + drama action or drama.

melody noun (melodies) 1 music the sequence of single notes forming the core of a tune, as opposed to the harmony. 2 pleasantness of sound; tuneful music. 3 especially in poetry: pleasant arrangement or combination of sounds.
ETYMOLOGY: 13c: from Greek melodia, from melos song + aoidein to sing.

melon noun 1 any of several plants of the gourd family, cultivated for their fruits. 2 the large rounded edible fruit of any of these plants, which generally have a thick skin, sweet juicy flesh and many seeds • watermelon.
ETYMOLOGY: 14c: French, from Greek melon apple.

melt verb (melted, melting) tr & intr 1 (sometimes melt down or melt something down) to make or become soft or liquid, especially through the action of heat; to dissolve (something solid). 2 (often melt into something) to combine or fuse, or make something combine or fuse with something else, causing a loss of distinctness. 3 (also melt away or melt something away) to disappear or make something disappear or disperse • support for the scheme melted away. 4 colloq to make or become emotionally or romantically tender or submissive • Her smile melted my heart. noun 5 the act of melting. 6 the quantity or material melted. melting noun, adj. meltingly adverb. melt in the mouth said of food: to be especially delicious, eg in lightness of texture.
ETYMOLOGY: Anglo-Saxon meltan (as the intransitive verb) and mæltan (the transitive).

meltdown noun 1 technical the overheating of the core of a nuclear reactor, causing radioactivity to escape into the environment. 2 colloq a major disaster or failure.

melting point noun (abbreviation mp) the temperature at which a particular substance (usually one that is solid at room temperature, eg a metal) changes from a solid to a liquid.

melting-pot noun 1 a place or situation in which varying beliefs, ideas, cultures, etc come together. 2 a vessel for melting something, eg metal, in. in the melting-pot in the process of changing and forming something new.