calculus n. A branch of math dealing with derivatives and integrals, based on the summation of infinitesimal differences. The beauty is the origin of the word – Latin “small pebble” – as in the stones used on an abacus. I like the thought of making those summations one calculus at a time. Also a medical term for kidney/gall stones.

nervure n. Entomology: each of the hollow veins forming the framework of an insect’s wings. Botany: the principal vein on a leaf. (note the small spaces between nervure are areola, from Latin “small open space”. I like this other, less-well-known meaning. It adds something nice to the commonly known meaning.)

soubriquet n. A person’s nickname.

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