| acral | Relating to or affecting the peripheral parts, e.g., limbs, fingers, ears, etc. Origin: G. Akron, extremity (05 Mar 2000) |
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| acral lentiginous melanoma | <tumour> A form of malignant lentigo melanoma that occurs in acral areas not excessively exposed to sunlight and where hair follicles are absent. (05 Mar 2000) |
| acrania | 1. <physiology> Partial or total absence of the skull. 2. <zoology> The lowest group of Vertebrata, including the amphioxus, in which no skull exists. Origin: NL, from Gr. Priv. + skull. Source: Websters Dictionary (01 Mar 1998) |
| acranial | Having no cranium; relating to acrania or an acranius. (05 Mar 2000) |
| acranius | A malformed foetus exhibiting acrania. (05 Mar 2000) |
| acraspeda | <zoology> A group of acalephs, including most of the larger jellyfishes; the Discophora. Origin: NL, fr. Gr. Priv. + border. Source: Websters Dictionary (01 Mar 1998) |