Enter a clue or pattern or both:

The Clue

Yellowish butterfly (7 letter answer)

The Answer

SULPHUR

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Notes

The answer SULPHUR is so rare that it appears less than once every 2500 puzzles.

Definition

SULPHUR as a noun:

1. (sulfur, S, sulphur, atomic number 16) = an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)

SULPHUR as a verb:

1. (sulphur, sulfur) = treat with sulphur in order to preserve; "These dried fruits are sulphured"