English

Noun

petrogr. ‎(uncountable)

1. Abbreviation of petrography.
   • 1997: Oxford English Dictionary, lithotype, n. (additions series 1997)

     Add: 4. Petrogr. A macroscopically visible constituent of coal distinguished by its physical characterisitics; a macroscopically distinguishable variety of coal. Cf. maceral n.

Synonyms

• petrog.

References

• The New Penguin Dictionary of Abbreviations: from A to zz, Rosalind Fergusson. (Penguin Books, 2000), page 301