| oca | <botany> A Peruvian name for certain species of Oxalis (O. Crenata, and O. Tuberosa) which bear edible tubers. Origin: Sp. Source: Websters Dictionary (01 Mar 1998) |
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| Occam's razor | The principle of scientific parsimony. William of Occam (14th Century) stated it thus: "The assumptions introduced to explain a thing must not be multiplied beyond necessity." (05 Mar 2000) |
| occamy | An alloy imitating gold or silver. Alternative forms: ochimy, ochymy, etc. Origin: A corruption of alchemy. Source: Websters Dictionary (01 Mar 1998) |
| occasional | Appearing or occurring irregularly and according to no fixed or certain scheme. (18 Nov 1997) |
| occasionalism | <psychology> The system of occasional causes; a name given to certain theories of the Cartesian school of philosophers, as to the intervention of the First Cause, by which they account for the apparent reciprocal action of the soul and the body. Source: Websters Dictionary (01 Mar 1998) |
| occidentals | Western Christians of the Latin rite. See Orientals. Source: Websters Dictionary (01 Mar 1998) |
| occipital | <anatomy> Of or pertaining to the occiput, or back part of the head, or to the occipital bone. <anatomy> Occipital bone, the point of the occiput in the mesial plane farthest from the ophryon. Origin: Cf. F. Occipital. <anatomy> The occipital bone. Source: Websters Dictionary (01 Mar 1998) |
| occipital anchorage | Anchorage in which the top and back of the head are used for resistance by means of a headgear. (05 Mar 2000) |
| occipital angle of parietal bone | The posterior superior angle of the parietal bone. Synonym: Broca's angles. Synonym: Daubenton's angle. (05 Mar 2000) |
| occipital artery | <anatomy, artery> Origin, external carotid; branches, sternocleidomastoid, meningeal, auricular, occipital, mastoid, and descending. Synonym: arteria occipitalis. (05 Mar 2000) |
| occipital belly of occipitofrontalis muscle | <anatomy> The posterior belly of the occipitofrontalis muscle. See: occipitofrontalis muscle. Synonym: venter occipitalis musculi occipitofrontalis, occipitalis muscle. (05 Mar 2000) |
| occipital bone | The bone forming the rear (and rear bottom) of the skull. (12 Dec 1998) |
| occipital border | Edge of a bone which articulates with the occipital bone. See: occipital border of parietal bone, occipital border of temporal bone. Synonym: margo occipitalis, occipital margin. (05 Mar 2000) |
| occipital border of parietal bone | The posterior margin of the parietal bone that articulates with the occipital squama. Synonym: margo occipitalis ossis parietalis. (05 Mar 2000) |
| occipital border of temporal bone | That part of the temporal bone that articulates with the occipital squama. Synonym: margo occipitalis ossis temporalis. (05 Mar 2000) |