The Wordsmith Dictionary

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English-Thai Dictionary

pitchstone

N หิน ภูเขาไฟ ที่ มี สี ดำ คล้าย น้ำมันดิน

Webster's 1913 Dictionary

PITCHSTONE

PITCHSTONE Pitch "stone `, n. (Geol.)

Defn: An igneous rock of semiglassy nature, having a luster like pitch.

New American Oxford Dictionary

pitchstone

pitch stone |ˈpiCHˌstōn ˈpɪtʃˌstoʊn | ▶noun Geology a dull vitreous rock resembling hardened pitch, formed by weathering of obsidian.

Oxford Dictionary

pitchstone

pitch |stone |ˈpɪtʃstəʊn | ▶noun [ mass noun ] Geology a dull vitreous rock resembling hardened pitch, formed by weathering of obsidian.