| acheron | A river in the Nether World or infernal regions; also, the infernal regions themselves. By some of the English poets it was supposed to be a flaming lake or gulf. Origin: L, fr. Gr. Source: Websters Dictionary (01 Mar 1998) |
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| achiasmatic | <cell biology> Undergoing meiosis, a process where the cells nucleus divides, without reaching the stage at which homologous chromatids pair to exchange genetic material (called chiasmata). (13 Nov 1997) |
| achievement | Success in bringing an effort to the desired end; the degree or level of success attained in some specified area (especially. Scholastic) or in general. (12 Dec 1998) |
| achievement age | The relationship between the chronologic age and the age of achievement, as established by standard achievement tests. (05 Mar 2000) |
| achievement motive | An acquired, chronic need to succeed in the face of recognizable obstacles; its strength is usually diagnosed from recurring themes in stories told by the individual while taking a thematic apperception test or from other assessment instruments used by clinical psychologists. (05 Mar 2000) |
| achievement test | A standardised test used to measure acquired learning, e.g., competence in a specific subject area such as reading or arithmetic, in contrast to an intelligence test which is a useful index of potential ability or learning. (05 Mar 2000) |
| Achilles | Mythical Greek warrior, vulnerable only in the heel. See: Achilles bursa, Achilles reflex, Achilles tendon. (05 Mar 2000) |
| Achilles bursa | Bursa between the tendo calcaneus and the upper part of the posterior surface of the calcaneum. Synonym: bursa tendinis calcanei, bursa achillis, Achilles bursa. (05 Mar 2000) |
| Achilles reflex | A contraction of the calf muscles when the tendo calcaneus is sharply struck. Synonym: ankle jerk, ankle reflex, tendo Achillis reflex, triceps surae reflex. (05 Mar 2000) |
| achilles tendon | <anatomy> The tendon which attaches to the heel and originates from the muscles in the calf (the gastrocnemius and soleus muscles). A strong fibrous tendon which connects the gastrocnemius muscle (calf) to the calcaneous bone in the foot. (27 Sep 1997) |
| achilles' tendon | <anatomy> The strong tendon formed of the united tendons of the large muscles in the calf of the leg, an inserted into the bone of the heel; so called from the mythological account of Achilles being held by the heel when dipped in the River Styx. Origin: L. Achillis tendo. Source: Websters Dictionary (01 Mar 1998) |
| achillobursitis | Inflammation of a bursa in proximity to the tendo calcaneus. Synonym: retrocalcaneobursitis. (05 Mar 2000) |
| achillodynia | Pain due to inflammation of the bursa between the calcaneus and the tendo calcaneus (achillobursitis). Origin: Achilles (tendon) + G. Odyne, pain (05 Mar 2000) |
| achillorrhaphy | Suture of the tendo calcaneus. Origin: Achilles (tendon) + G. Rhaphe, a sewing (05 Mar 2000) |
| achillotenotomy | Synonym: achillotomy. Origin: Achilles (tendon) + G. Tenon, tendon, + tome, a cutting (05 Mar 2000) |