Mem·bra·nous a.
1. Pertaining to, consisting of, or resembling, membrane; as, a membranous covering or lining.
2. Bot. Membranaceous.
Membranous croup Med., true croup. See Croup.
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Croup n. Med. An inflammatory affection of the larynx or trachea, accompanied by a hoarse, ringing cough and stridulous, difficult breathing; esp., such an affection when associated with the development of a false membrane in the air passages (also called membranous croup). See False croup, under False, and Diphtheria.
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