Englishfor English speakers
auf
noun
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(obsolete) A changeling or elf child; a child left by fairies.
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(obsolete) A deformed or foolish child; a simpleton; an oaf.
Haken
adjective
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(topology, of a 3-manifold) Irreducible, compact, and containing a non-∂-parallel incompressible surface (besides a sphere or disk).