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| major grouping of small-to-microscopic pseudocoelomate organisms |
| having a backbone or spinal column |
| longitudinal (ˌlɒndʒɪˈtjuːdɪnəl, ˌlɒŋɡ-) | |
| —adj | |
| 1. | of or relating to longitude or length |
| 2. | Compare transverse placed or extended lengthways |
| 3. | psychol (of a study of behaviour) carried on over a protracted period of time |
| longi'tudinally | |
| —adv | |
longitudinal lon·gi·tu·di·nal (lŏn'jĭ-t&oomacr;d'n-əl, -ty&oomacr;d'-)
adj.
Running in the direction of the long axis of the body or any of its parts.