pla·no-con·cave 
(plā′nō-kŏn-kāv, -kŏnkāv′)
(plā′nō-kŏn-kāv, -kŏnkāv′)adj.
Flat on one side and concave on the other: a plano-concave lens.
plano-concaveLight rays disperse through a plano-concave lens.
- circinately
- Circinus
- circle
- circle graph
- circler
- circlet
- circle the wagons
- circuit
- circuit board
- circuit breaker
- circuit court
- circuitous
- circuitously
- circuitousness
- circuit rider
- circuitry
- circuit training
- circuity
- circular
- circular file
- circular function
- circularity
- circularization
- circularize
- circularizer