Etymology
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Words related to warm

*gwher- 

Proto-Indo-European root meaning "to heat, warm."

It forms all or part of: brand; brandish; brandy; brimstone; brindled; forceps; Fornax; fornicate; fornication; fornix; furnace; hypothermia; thermal; thermo-; Thermopylae; Thermos.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit gharmah "heat;" Old Persian Garmapada-, name of the fourth month, corresponding to June/July, from garma- "heat;" Hittite war- "to burn;" Armenian jerm "warm;" Greek thermos "warm;" Latin formus "warm," fornax "oven;" Old Irish fogeir "heated;" Old English bærnan "to kindle."

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heart-warming (adj.)
also heartwarming, 1620s, from heart (n.) + present participle of warm (v.).
housewarming (n.)
also house-warming, "celebration of the entry of a family into a new home," 1570s, from house (n.) + verbal noun from warm (v.).
leg-warmer (n.)
1974, from leg (n.) + agent noun from warm (v.). Related: Leg-warmers.
-ate (2)
verbal suffix for Latin verbs in -are, identical with -ate (1). Old English commonly made verbs from adjectives by adding a verbal ending to the word (such as gnornian "be sad, mourn," gnorn "sad, depressed"), but as the inflections wore off English words in late Old and early Middle English, there came to be no difference between the adjective and the verb in dry, empty, warm, etc. Thus accustomed to the identity of adjectival and verbal forms of a word, the English, when they began to expand their Latin-based vocabulary after c. 1500, simply made verbs from Latin past-participial adjectives without changing their form (such as aggravate, substantiate) and it became the custom that Latin verbs were Englished from their past participle stems.
lukewarm (adj.)

"neither cold nor hot, tepid," late 14c., from warm (adj.) + luke (adj.) "tepid" (c. 1200), a word of unknown origin. 

Figurative sense of "lacking in zeal, not ardent" (of persons or their actions) is from 1520s. Related: Lukewarmly; lukewarmness. Luke-warmth (1590s) is marked "rare" in OED.

warmly (adv.)
1520s, of feelings; 1590s, of temperature, from warm (adj.) + -ly (2).
warmth (n.)
late 12c., wearmth, Proto-Germanic *warmitho- (source also of Middle Low German wermede, Dutch warmte), from *warmo- (see warm (adj.); also see -th (2)).