From wikipedia:
"In morphology and lexicography, a lemma (plural lemmas or lemmata) is the canonical form, dictionary form, or citation form of a set of words (headword). In English, for example, run, runs, ran and running are forms of the same lexeme, with run as the lemma. Lexeme, in this context, refers to the set of all the forms that have the same meaning, and lemma refers to the particular form that is chosen by convention to represent the lexeme. In lexicography, this unit is usually also the citation form or headword by which it is indexed. Lemmas have special significance in highly inflected languages such as Arabic, Turkish and Russian. The process of determining the lemma for a given word is called lemmatisation. The lemma can be viewed as the chief of the principal parts, although lemmatisation is at least partly arbitrary."
1. A typical Hebrew lemma search in Logos has a search argument of <Lemma = lbs/he/אָב> where the "lbs" indicates the Logos morphology lemma system and the "he" indicates Hebrew/Aramaic. This is usually the most productive Hebrew lemma search.

2. If I change the "lbs" to "lls" I am requesting the GRAMCORD Greek Morphology & Westminster Hebrew Morphology. This returns only one resource with this tagging:

3. If I change the "lls" to "af" for the Andersen-Forbes Morphology I get interesting results - nothing! why? because AF has two lemmas אָב and I must specify which one I mean.

