Apterium
"Apterium" in a Sentence (1 examples)
The two halves of the lower cervical tract are still separated by an apterium 4 mm. wide, as in the young bird, but contour feathers are now present on the chin and upper throat, so that they are united at their upper ends.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.