Hypertext Webster Gateway: "porphyritic"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Porphyritic \Por`phy*rit"ic\, a. [Cf. F. porphyritique.] (Min.)
Relating to, or resembling, porphyry, that is, characterized
by the presence of distinct crystals, as of feldspar, quartz,
or augite, in a relatively fine-grained base, often aphanitic
or cryptocrystalline.
From WordNet (r) 1.7 (wn)
porphyritic
adj : (of rocks) consisting of porphyry or containing large
crystals in a fine groundmass of minerals
Additional Hypertext Webster Gateway Lookup
Gateway by dict@stokkie.net
stock only wrote the gateway and does not have any control over the contents;
see the Webster Gateway FAQ,
and also the Back-end/database links and credits.