Obsidian
[uh b-sid-ee-uh n] /əbˈsɪd i ən/
noun
1.
a volcanic glass similar in composition to granite, usually dark but transparent in thin pieces, and having a good conchoidal fracture.
/ɒbˈsɪdɪən/
noun
1.
a dark volcanic glass formed by very rapid solidification of lava Also called Iceland agate
n.
“dark, hard volcanic rock,” 1650s, from Latin obsidianus, misprint of Obsianus (lapis) “(stone) of Obsius,” name of a Roman alleged by Pliny to have found this rock in Ethiopia.
obsidian
(ŏb-sĭd’ē-ən)
A shiny, usually black, volcanic glass. Obsidian forms above ground from lava that is similar in composition to the magma from which granite forms underground, but cools so quickly that minerals do not have a chance to form within it.
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[uh b-sid-ee-uh-nl] /əbˈsɪd i ə nl/ noun 1. .
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[ob-suh-les-uh ns] /ˌɒb səˈlɛs əns/ noun 1. the state, process, or condition of being or becoming obsolete. n. 1809; see obsolescent + -ence. Phrase Planned obsolescence coined 1932, revived as a disparaging term 1950s. obsolescence [(ob-suh-les-uhns)] A decline in the value of equipment or of a product brought about by an introduction of new technology […]
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[ob-suh-les] /ˌɒb səˈlɛs/ verb (used without object), obsolesced, obsolescing. 1. to be or become . /ˌɒbsəˈlɛs/ verb 1. (intransitive) to become obsolete v. 1801, from Latin obsolescere “to grow old, wear out, lose value, become obsolete,” inchoative of obsolere “fall into disuse” (see obsolete). Related: Obsolesced; obsolescing.