Webster's 1828 Dictionary

PLANO-CONICAL

a.[plain and conical. ] Plain or level on one side and conical on the other.

 

PLANO-CONVEX

a.[plain and convex. ] Plain or flat on one side and convex on the other; as a plano-convex lens.

 

PLANO-SUBULATE

a.[See Subulate. ] Smooth and awl-shaped.

 

Webster's 1913 Dictionary

PLANO-

PLANO- Pla "no-.

 

Defn: See Plani-.

 

PLANO-CONCAVE

Pla "no-con "cave, a. Etym: [Plano- + concave. ]

 

Defn: Plane or flat on one side, and concave on the other; as, a plano-concave lens. See Lens.

 

PLANO-CONICAL

Pla "no-con "ic *al, a. Etym: [Plano- + conical. ]

 

Defn: Plane or flat on one side, and conical on the other. Grew.

 

PLANO-CONVEX

Pla "no-con "vex, a. Etym: [Plano- + convex. ]

 

Defn: Plane or flat on one side, and convex on the other; as, a plano-convex lens. See Convex, and Lens.

 

PLANO-HORIZONTAL

Pla "no-hor `i *zon "tal, a. Etym: [Plano- + horizontal. ]

 

Defn: Having a level horizontal surface or position. Lee.

 

PLANO-ORBICULAR

Pla "no-or *bic "u *lar, a. Etym: [Plano- + orbicular. ]

 

Defn: Plane or flat on one side, and spherical on the other.

 

PLANO-SUBULATE

Pla "no-su "bu *late, a. Etym: [Plano- + subulate. ]

 

Defn: Smooth and awl-shaped. See Subulate.

 

New American Oxford Dictionary

plano-

plano- ▶comb. form level; flat: plano-convex | planography. ORIGIN from Latin planus ‘flat. ’

 

plano-concave

pla no-con cave |ˌplānōˌkänˈkāv, -ˈkänˌkāv ˌpleɪnoʊˈkɑnˌkeɪv | ▶adjective (of a lens ) with one surface plane and the opposite one concave.

 

plano-convex

pla no-con vex |ˌplānōˌkänˈveks, -ˈkänˌveks ˌpleɪnoʊˌkɑnˈvɛks | ▶adjective (of a lens ) with one surface plane and the opposite one convex.

 

Oxford Dictionary

plano-

plano- |ˈpleɪnəʊ | ▶combining form level; flat: planoconvex | planometer. ORIGIN from Latin planus ‘flat ’.