| acorn | 1. <botany> The fruit of the oak, being an oval nut growing in a woody cup or cupule. 2. A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head. Origin: AS. Aecern, fr. Aecer field, acre; akin to D. Aker acorn, Ger. Ecker, Icel. Akarn, Dan. Agern, Goth. Akran fruit, akrs field; orig. Fruit of the field. Source: Websters Dictionary (01 Mar 1998) |
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| acorn-shell | <zoology> One of the sessile cirripeds; a barnacle of the genus Balanus. Source: Websters Dictionary (01 Mar 1998) |
| acorn-tipped catheter | A catheter used in ureteropyelography to occlude the ureteral orifice and prevent backflow from the ureter during and following the injection of an opaque medium. (05 Mar 2000) |
| sea acorn | <zoology> An acorn barnacle (Balanus). Source: Websters Dictionary (01 Mar 1998) |
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