AMYGDALOID n.
iety of trap or basaltic rock, containing small cavities, occupied, wholly or in part, by nodules or geodes of different minerals, esp. agates, quartz, calcite, and the zeolites. When the imbedded minerals are detached or removed by decomposition, it is porous, like lava.
AN n. 2 definitions
s properly an adjective, but is commonly called the indefinite article. It is used before nouns of the singular number only, and signifies one, or any, but somewhat less emphatically. In such expressions as "twice an hour," "once an age," a shilling an ounce (see 2d A, 2), it has a distributive force, and is equivalent…
ANA n. 3 definitions
A suffix to names of persons or places, used to denote a collection of notable sayings, literary gossip, anecdotes, etc. Thus, Scaligerana is a book containing the sayings of Scaliger, Johnsoniana of Johnson, etc.