(endocrinology) an enzyme attached to the membrane of cells in various organs and lowers blood pressure by catalyzing the hydrolysis of angiotensin II into angiotensin (1-7)

(virology) A subtype of HIV, not widely recognized outside of Africa, related to viruses found in the sooty mangabey.

Under the Whyte notation system, a steam locomotive that has two leading wheels, three sets of eight driving wheels, and four trailing wheels.

plural of 2-8-8-8-2

plural of 2-8-8-8-4

plural of 2-8-0+0-8-2

plural of 2-6-0+0-6-2

(idiomatic) In hindsight things are obvious that were not obvious from the outset; one is able to evaluate past choices more clearly than at the time of the choice.

(physics) A radioactive isotope of polonium, ²¹⁰₈₄Po, having a half-life of 138 days; it as used as a reference alpha emitter in the calibration of radiation counters

(physics) The major stable isotope of neon, ²⁰₁₀Ne, having ten protons and ten neutrons; it amounts to over 90% of the element in nature