| fibrillar | 1. Relating to a fibril. 2. <biology> Denoting the fine rapid contractions or twitchings of fibres or of small groups of fibres in skeletal or cardiac muscle. Synonym: filar. (05 Mar 2000) |
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| fibrillar baskets | <biology> The scleral end of neuroglia fibres of Muller that as fine, tapering, needlelike fibrillae ascend the proximal parts of rods and cones, giving them a fibrillar appearance. (05 Mar 2000) |
| fibrillar centre | <cell biology> Location of the nucleolar ribosomal chromatin at telophase: as the nucleolus becomes active the ribosomal chromatin and associated ribonucleoprotein transcripts compose the more peripherally located dense fibrillar component. (12 Nov 1997) |
| fibrillar region | <cell biology> Dense staining region of the nucleolus composed of 5nm fibres, RNA transcripts. (12 Nov 1997) |