1. (n.)hearth the floor of a fireplace, usu. of stone, brick, etc., often extending into a room.
2. hearth the lower part of a blast furnace, cupola, etc., in which the molten metal collects and from which it is tapped out.
3. hearth the part of an open hearth, reverberatory furnace, etc., upon which the charge is placed and melted down or refined.
4. hearth a brazier or chafing dish for burning charcoal.
Etymology: (bef. 900; ME herth(e), OE he(o)rth, c. OS herth, OHG hert)
Definition of 'hearth'
Princeton's WordNet
1. (noun)fireplace, hearth, open fireplace an open recess in a wall at the base of a chimney where a fire can be built "the fireplace was so large you could walk inside it"; "he laid a fire in the hearth and lit it"; "the hearth was black with the charcoal of many fires"
2. (noun)hearth, fireside home symbolized as a part of the fireplace "driven from hearth and home"; "fighting in defense of their firesides"
3. (noun)hearth, fireside an area near a fireplace (usually paved and extending out into a room) "they sat on the hearth and warmed themselves before the fire"
Definition of 'hearth'
Webster Dictionary
1. (noun)hearth the pavement or floor of brick, stone, or metal in a chimney, on which a fire is made; the floor of a fireplace; also, a corresponding part of a stove
2. (noun)hearth the house itself, as the abode of comfort to its inmates and of hospitality to strangers; fireside
3. (noun)hearth the floor of a furnace, on which the material to be heated lies, or the lowest part of a melting furnace, into which the melted material settles
Definitions of hearth 
Afrikaans: vuurherd, haard
Arabic: مَوْقِد، مِدْفَأه
Bulgarian: огнище
Brazilian: lareira
Czech: krb
German: der Kamin
Danish: pejs; kamin
Greek: τζάκι
Spanish: hogar, chimenea
Estonian: kolle
Farsi: اجاق
Finnish: tulisijanääri
French: foyer,âtre
Hebrew: אָח
Hindi: अंगीठी
Croatian: ognjište
Hungarian: kandalló
Indonesian: perapian, pendiangan
Icelandic: arinn; arinhella
Italian: focolare
Japanese: 炉辺
Korean: 벽난로
Lithuanian: židinys
Latvian: kamīns; pavards
Malay: perdiangan
Dutch: haardplaats
Norwegian: peis, ildsted,åpen kamin
Polish: kominek
Persian: اجاق
Pashto: ديوالى بخارۍ ، نغرى ديګدا
Portuguese: lareira
Romanian: cămin, şemineu
Russian: очаг
Slovak: krb
Slovenian: ognjišče
Serbian: ognjište
Swedish: härd, spis[el]
Thai: พื้นเตา
Turkish: ocak,şömine
Taiwanese: 壁爐
Ukrainian: домашнє вогнище
Urdu: آتش دان کا فرش
Vietnamese: lò sưởi
Chinese: 灶台，炉边
