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altar [altar 词源字典]: altar: [OE] The etymological notion underlying the word altar is that of sacrificial burning. Latin altar, which was borrowed directly into Old English, was a derivative of the plural noun altāria, ‘burnt offerings’, which probably came from the verb adolēre ‘burn up’. Adolēre in turn appears to be a derivative of olēre ‘smell’ (the connection being the smell made by combustion), which is related to English odour, olfactory, and redolent. (The traditional view that altar derives from Latin altus ‘high’ is no longer generally accepted, although no doubt it played a part, by association, in its development.) In Middle English, the Old French form auter replaced altar, but in the 16th century the Latin form re-established itself.
=> odour, olfactory, redolent[altar etymology, altar origin, 英语词源]
combust: late 14c. as an adjective, "burnt," from Old French combust (14c.), from Latin combustus, past participle of combuere "to burn up, consume" (see combustion). Also an astrological term for planets when near the sun. The verb is attested from late 15c. Related: Combusted; combusting.
combustible (adj.): 1520s, from Middle French combustible, or directly from Late Latin combustibilis, from Latin combustus, past participle of combuere "to burn up, consume" (see combustion). Figurative sense is from 1640s; as a noun, from 1680s. Related: Combustibility (late 15c.).
combustion (n.): early 15c., from Old French combustion (13c.), from Latin combustionem (nominative combustio) "a burning," noun of action from past participle stem of Latin comburere "to burn up, consume," from com-, intensive prefix (see com-), + *burere, faulty separation of amburere "to burn around," actually ambi-urere, from urere "to burn, singe," from PIE root *eus- "to burn" (see ember).
conflagration (n.): 1550s, from Middle French conflagration (16c.) or directly from Latin conflagrationem (nominative conflagratio), present participle of conflagrare "to burn up," from com-, intensive prefix (see com-), + flagrare "to burn" (see flagrant).
melt (v.): Old English meltan "become liquid, consume by fire, burn up" (class III strong verb; past tense mealt, past participle molten), from Proto-Germanic *meltanan; fused with Old English gemæltan (Anglian), gemyltan (West Saxon) "make liquid," from Proto-Germanic *gamaltijan (cognates: Old Norse melta "to digest"), both from PIE *meldh-, (cognates: Sanskrit mrduh "soft, mild," Greek meldein "to melt, make liquid," Latin mollis "soft, mild"), from root *mel- "soft," with derivatives referring to soft or softened (especially ground) materials (see mild). Figurative use by c. 1200. Related: Melted; melting.

Of food, to melt in (one's) mouth is from 1690s. Melting pot is from 1540s; figurative use from 1855; popularized with reference to America by play "The Melting Pot" by Israel Zangwill (1908).