Sinapi denotes the seed used in comparisons of sowing, growth, and faith in the cited verses.

The attested use is a seed in comparisons: it is sown and grows in Luke 13:19, Mark 4:31, and Matthew 13:31, while Luke 17:6 and Matthew 17:20 compare faith to it.

1. Seed in illustrative comparisons · dominant

   The genitive singular neuter form occurs in comparisons involving a seed. In Luke 13:19 the APB renders a seed thrown into a garden that grew into a tree; in Mark 4:31 and Matthew 13:31 it renders a seed sown on the earth or in a field, and in Luke 17:6 and Matthew 17:20 faith is compared to such a seed.

   Luke 13:19Luke 17:6Mark 4:31Matthew 13:31Matthew 17:20

In the Anselm Project Bible: Across the cited verses, the APB consistently presents the term within the phrase "mustard seed." That phrase confirms the verse-level comparison rather than isolating a separate English equivalent for the Greek form.