Adjective
rhamphoid (not comparable)
(mathematics) Of a cusp: defined by the equation
(
y
−
x
2
)
2
=
x
5
{\displaystyle (y-x^{2})^{2}=x^{5}}
, which is parametrized by
(
t
2
,
t
4
+
t
5
)
{\displaystyle (t^{2},t^{4}+t^{5})}
; having two branches with concavity in the same direction.