adumbrate (v. t.)

To give a faint shadow or slight representation of; to outline; to shadow forth. Metaphorically, to give a rough outline of, to explain at a high level.

aleatory (a.)

Depending on chance, something that can’t be anticipated.

anneal (v.t.)

To heat and cool in order to temper or toughen a material. Alternately to fire something to keep its color.

azygous (a.)

One, having no match, not one of a pair.

catachresis (n.)

A figure by which one word is wrongly put for another, or by which a word is wrested from its true signification.

charrette (n.) 🆕

An intense period of work, especially group work, especially to meet a deadline.

chatoyant (a. (or noun if you mean the mineral))

Having a changeable, varying luster, or color, like that of a changeable silk, or of a cat’s eye in the dark.

dugnad (n.) (eng. pl. dugnads, nor. pl. dugnader) 🆕

From Norwegian. Unpaid orchestrated group volunteer work. Often followed by a meal that may or may not be a potluck and thus a dugnad itself.

eft (n.)

Old English efte, efeta “small lizard-like animal,” of unknown origin (see newt).

eustasy (n.)

A worldwide change in sea level, especially one caused by melting ice or tectonic activity.

synadelphic (a.)

Acting together, as different members of an animal body.

synallagmatic (a.)

Imposing reciprocal legal obligations upon the parties; bilateral.

synaxis (n.)

An assembly, referring to specific feasts in the Eastern church.

synedrion (n., pl. synedria)

An assembly that holds formal sessions.

synesis (n.)

A grammatical construction in which a word takes the gender or number not of the word with which it should regularly agree, but of some other implied word, as in: “If the band are popular, they will play next month.” Alternatively, the faculty of good judgment or comprehension, passive intelligence.

syntomy (n.)

brevity; conciseness

vair (n.)

“squirrel fur,” or some other kind of fur in use in the Middle Ages, c. 1300, from Old French vair “two-toned squirrel fur; fur garments” (12c.), from Latin varium, masculine accusative singular of varius “parti-colored” (see vary). Gray or black above and white below.