Many sulci are the product of a surface fold or junction, such as in the gums, where they fold around the neck of the tooth. The term sulcus is used in invertebrate zoology to describe folds, grooves, and boundaries, especially at the edges of sclerites or between segments. In botany and palynology, the surface morphology of seeds and pollen grains is termed sulcate if one or more sulci form major features.
Freebase(0.00 / 0 votes)Rate this definition: Gratitude. Gratitude, thankfulness, gratefulness, or appreciation is a feeling or attitude in acknowledgment of a benefit that one has received or will receive.
Definition-wise, the two words don't seem to differ much, but it is worthwhile to note that the definition of gratitude includes having appreciation, whereas the definition for appreciation does not require gratitude. Source: The Difference Between Gratitude and Appreciation | eHow. Written Nov 21, 2013 Â· View Upvotes.