Some words whose meanings I have learned this month:
belicose
adj. Warlike / hostile in manner / temperament
bumptious
adj. arrogant; pushy; offensively self-assertive; conceited
de facto
In reality or fact
de facto standard: Accepted by custom, convention or common practice
dendroglyph
noun. Tree carving, often geometric, found in Australia and the Chatham Islands
nonce
noun. Single occasion; the present call or purpose
pellucid
adj. Admitting the passage of light; transparent or translucent.
vertiginous
adj. Having / causing a whirling sensation; whirling; turning; revolving; liable to falling; affected with vertigo; giddy; dizzy