— aphanitic /af'euh nit"ik/ , adj.
/af"euh nuyt'/ , n. Petrog.
a fine-grained igneous rock having such compact texture that the constituent minerals cannot be detected with the naked eye.
[ 1860-65; aphan ( és ) unseen, hidden, invisible ( a- A- 6 + phanes, adj. deriv. of phaínein to bring to light, disclose) + -ITE 1 ]