Low means you can eat several servings per day of this food and not go over the suggested daily value for that nutrient. 1  The word low is used to describe fat, calorie, and sodium contents of foods. 2  Low fat means less than or equal to 3g total fat per serving. 3  A low calorie food has 40 calories or less per serving.
Webster Dictionary(0.00 / 0 votes)Rate this definition: 1  Hypo-. a prefix signifying a less quantity, or a low state or degree, of that denoted by the word with which it is joined, or position under or beneath. 2  Hypo-.
home / medterms medical dictionary a-z list / sub- definition Medical Definition of Sub- Sub-: Prefix meaning meaning under, below, less than normal, secondary, less than fully. As in subacute, subaortic stenosis, subarachnoid, subclavian, subclinical disease, subcutaneous, subdural, subglottis, subjacent, sublingual, subluxation, and subtotal hysterectomy. From the Latin preposition sub meaning under. See also: Hypo-.