Definition of "Bt"

Bt

noun
usually uncountable, plural Bts
1. Abbreviation of baronet, a title used after a holder's surname.
2. (bacteriology, agriculture) Bacillus thuringiensis, a species of bacteria used for biological control of insects.
  1. Ellipsis of Bt toxin.
3. (bacteriology) Initialism of botulinum toxin.
4. (mineralogy) Abbreviation of biotite.
  Quotations
  (A) Plane-polarized light and (B) back-scattered electron (BSE) images. The pseudomorph (Crd) is made up of Grt + Qtz + Ky rodlets + micas flakes (mainly biotite, Bt).
  2017, J. Theo Kloprogge, Robert Lavinsky, “Introduction: Geological Examples”, in Photo Atlas of Mineral Pseudomorphism, Amsterdam: Elsevier, page 88