aegis (en)

(noun, Greek mythology) protective mantle of Zeus given to Athena

elision (en)

(linguistics) the omission of a sound or syllable when speaking OR the act or an instance of omitting something

fractious (en)

difficult to control; unruly; irritable and quarrelsome

lapidary (en)

relating to stone and gems and the work involved in engraving, cutting, or polishing

lucent (en)

(adjective) glowing with light; luminous / (adjective) marked by clarity or translucence; clear

rarefied (en)

(adjective) being less dense / (adjective) of, relating to, or interesting to a select group; esoteric / (adjective) very high / (verb) to make rare, thin, porous, or less dense; to expand without the addition of matter / (verb) to make more spiritual, refined, or abstruse / (verb) to become less dense