Alternative letter-case form of black (“of or relating to any of various ethnic groups having dark pigmentation of the skin”)

A type of knot generally known as the artillery loop.

(organic chemistry) Hypothetically, one of the Platonic hydrocarbons, C₄H₄, having the carbon atoms at the vertices of a tetrahedron; has not yet been synthesized, and would be very unstable.

Acronym of children's health insurance program. / (medicine) Acronym of clonal hematopoiesis of indeterminate potential.