| ANGUSTIROSTRATE | • ANGUSTIROSTRATE adj. narrow-beaked. |
| BIROSTRATE | • birostrate adj. (Rare) Having two beaks (or beak-like structures). • BIROSTRATE adj. double-beaked. |
| CONIROSTRAL | • conirostral adj. (Zoology) Belonging to the tribe Conirostres of perching birds with strong conical beaks. • CONIROSTRAL adj. having a strong conical beak, like e.g. most finches. |
| CURVIROSTRAL | • curvirostral adj. (Zoology) Having a crooked beak. • CURVIROSTRAL adj. having a curved bill. |
| DENTIROSTRAL | • dentirostral adj. (Zoology) Having a toothed bill. • DENTIROSTRAL adj. with notched beak. |
| FISSIROSTRAL | • fissirostral adj. Having the bill cleft beyond the horny part, as in the case of swallows and goatsuckers. • FISSIROSTRAL adj. having a divided beak. |
| LAMELLIROSTRAL | • lamellirostral adj. (Zoology) Having a lamellate bill. • LAMELLIROSTRAL adj. having transverse lamellae within the edge of the bill, also LAMELLIROSTRATE. |
| LAMELLIROSTRATE | • LAMELLIROSTRATE adj. having transverse lamellae within the edge of the bill, also LAMELLIROSTRAL. |
| LATIROSTRAL | • LATIROSTRAL adj. having a broad beak, also LATIROSTRATE. |
| LATIROSTRATE | • latirostrate adj. (Zoology) Having a broad bill. • LATIROSTRATE adj. having a broad beak, also LATIROSTRAL. |
| LONGIROSTRAL | • longirostral adj. (Zoology) Having a long bill. • longirostral adj. (Zoology) Of or pertaining to the Longirostres. • LONGIROSTRAL adj. having an elongated beak. |
| RECTIROSTRAL | • RECTIROSTRAL adj. having straight beak. |
| RECURVIROSTRAL | • RECURVIROSTRAL adj. with up-bent bill. |
| SERRATIROSTRAL | • serratirostral adj. (Zoology) Having a toothed bill, like that of a toucan. • SERRATIROSTRAL adj. saw-billed. |
| TENUIROSTRAL | • tenuirostral adj. (Zoology) Having a thin bill. • TENUIROSTRAL adj. of a bird, slender-billed. |