(archaic) second-person singular simple present form of thunder

fulgurite

(dated) lightning rod

Agkistrodon contortrix laticinctus, the broad-banded copperhead. / Agkistrodon contortrix mokasen, the northern copperhead. / Lampropeltis getula getula, the eastern kingsnake.

(simile) Very black (especially of a mood, a frown, etc.).

plural of thunbergia

(botany) Any member of the genus Thunbergia of flowering plants.

thunder and sleet at the same time

Third-person singular simple present indicative form of steal one's thunder

(idiomatic) To appropriate someone's ideas or information, typically in order to look better at that person's expense. / (idiomatic) To detract from someone's accomplishments or glory; to undermine.