some words

exhilarating: estimulante

knocking: golpes, golpeteo

grin: sonrisa

smug: presumido

superb: magnífico, espléndido

murky: (murkier, murkiest)
(casa, pasado) oscuro,-a, tenebroso,-a
(agua) turbio,-a, sucio,-a
murky water, agua sucia

butcher: carnicero

baker: panadero

canny: adjetivo inteligente, astuto

feurebach

I was reading a manual LaTeX and found a word not seen before "feuerbach"

In the picture, a triangle is drawn with the inscribed and the circumscribed circle (solid), the three adjacent circles (dashed), and the nine point (Feuerbach) circle (dotted).

wrapped butterfly

In the same article says: In this paper, we determine the complete spectra (eigenvalues and multiplicities) of wrapped butterfly digraphs.

I do not understand "wrapped butterfly"

butterfly digraph & butterfly network

I was reading an article, "butterfly digraph" and "butterfly network", both are keywords but I do not understand