(of a Jew) Very strictly observant; Haredi; being either Hasidic or Litvish (Misnagdic).

(chemistry) The hypothetical compound C(OH)₄ known only as its derivatives, the orthocarbonates

(organic chemistry) Any orthoester, formally derived from acetic acid, of general formula CH₃C(OR)₃

(organic chemistry) Any polyether, of general formula C(O-R)₄, formally derived from orthocarbonic acid

(organic chemistry) Any orthoester, formally derived from benzoic acid, of general formula C₆H₅-C(OR)₃

The faith, practices, etc. of the Eastern Orthodox Church.

plural of orthocarbonate

plural of orthobenzoate

plural of orthoacetate

(mathematics) A bicupola in which the bases have the same orientation