an optical glass of low dispersion and generally low index of refraction.
an old form of window glass formed by blowing a globe and whirling it into a disk.
another name for optical crown
an old form of window glass made by blowing a globe and spinning it until it formed a flat disc
noun, Horticulture. 1. a graft in which the scion is inserted at the crown of the stock. noun 1. (horticulture) a type of graft in which the scion is inserted at the crown of the stock
- Crown green
noun 1. a type of bowling green in which the sides are lower than the middle
- Crown-heel length
crown-heel length n. The length of an embryo or fetus measured from the skull vertex to the heel.
noun 1. an Iranian plant, Fritillaria imperialis, of the lily family, having a purple-spotted stem and a whorl of usually reddish-orange flowers hanging beneath a tuft of leaves, grown as an ornamental. noun 1. a liliaceous garden plant, Fritillaria imperialis, with a cluster of leaves and orange bell-shaped flowers at the top of the stem