معنی کلمه :‌ subtrihedral

Approaching the form of a three-sided pyramid; as, the subtrihedral crown of a tooth.

1. Pleased; joyful; cheerful. 2. Causing joy, pleasure, or cheerfulness; having the appearance of gayety; pleasing. Of opening heaven they sung, and gladsome day. Prior. -- Glad"some*ly, adv. -- Glad"some*ness, n. Hours of perfect gladsomeness. Wordsworth.