One of the two bracts enclosing the flower or spikelet of rice. It becomes the covering of two-thirds of the rice seed surface and has five vertical ridges, formed along the surface, from the vascular bundles.
It is the group of all inflected forms of a word. For example, the lemma of all the forms of a verb is the infinitive (e.g., "be" for "is", "were", or "was"). The lemma of a plural is the singular (e.g., "foot" for "feet", or "protein" for "proteins").
the headword or citation form of an inflected word, especially the form found in a bilingual dictionary. This is usually, for verbs: the infinitive or the present tense, first person singular; and for nouns: the nominitive singular. (In linguistics the word is sometimes used in a sense which includes this definition plus all the inflections cf lexeme).
In linguistics, and particularly in morphology, a lemma or citation form is the canonical form of a lexeme. Lexeme 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. Lemmas have special significance in highly inflected languages such as Czech.