| arrowwood | <botany> A shrub (Viburnum dentatum) growing in damp woods and thickets; so called from the long, straight, slender shoots. Source: Websters Dictionary (01 Mar 1998) |
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| arrowworm | <zoology> A peculiar transparent worm of the genus Sagitta, living at the surface of the sea. See: Sagitta. Source: Websters Dictionary (01 Mar 1998) |
| Arruga | Count Hermenegildo, Spanish ophthalmologist, 1886-1972. See: Arruga's forceps. (05 Mar 2000) |
| Arruga's forceps | Forceps for the intracapsular extraction of a cataract. (05 Mar 2000) |