Amygdaloid
an igneous crystalline, or, as the case may be, vitreous rock (lava), containing numerous cells, which owe their origin to the segregation and expansion of steam, with which all lavas are more or less charged at the time of their eruption. The cells vary in size inches, or even feet, in diameter. The cells are generally flattened or drawn out in the direction of flow of the lava, and are frequently filled with mineral matter inches, or even feet, in diameter. The cells are generally flattened or drawn out in the direction of flow of the lava, and infiltrating water. This is the origin of many of the agates and so-called "Scotch pebbles" of jewelers.
AMYGDALUS (am-ig'dal-us), a genus of plants belonging to the order drupaceæ, or almond-worts. It contains, among other species, the common peach, amygdalus persica, with the nectarine nectarina), the almond, amygdalus communis, with the variety amara, (variety nec or bitter almond.
AMYL (C.Hn), the fifth in the series of alcohol radicals whose general formula is CnH2n +1, and of which methyl and ethyl are the first two members. It has an agreeable smell and burning taste. It enters into a large number of chemical compounds, most of which as, for instance, bromide, chloride, iodide, etc. are derived from amylic alcohol, and ethyl are the first two members. It has an agreeable smell and burning taste. It enters into a large number of to amyl that ordinary alcohol bears to ethyl, C2H5.