birdcall
(complex analysis, differential geometry) A geometric counterpart to Nevanlinna theory that extends the applicability of the concept of covering surface (of a topological space) by defining a cover...
(mineralogy) A variety of vermiculite.
Any vocalisation of a bird. / An imitation of this cry. / A device used to imitate this cry, so as to lure and catch birds.
Not astonished.
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★★★★★★★★★★