...took his [Curifin's] knife there gleaming pale,
hanging sheathless, wrought of steel.
No flesh could leeches ever heal
that point had pierced; for long ago
the dwarves made it, singing slow
enchantments, where their hammers fell
in Nogrod ringing like a bell.
Iron as tender wood it cleft,
ans sundered mail like woolen weft.

(HoME III, The Lays of Beleriand, The Lay of Leithian, 3053-3062)

the sheathless knife he [Beren] drew, and knelt,
and tried its hard edge, bitter-cold,
o'er which in Nogrod songs had rolled
of dwarvish armourers singing slow
to hammer-music long ago.
Iron as tender wood it clove
and mail as woof of loom it rove.
The claws of iron that held the gem,
it bit them through and sundered them;
...
The dwarvish steel of cunning blade
by treacherous smith of Nogrod made
snapped; then ringing sharp and clear
in twain it sprang, and like a spear
of errant shaft the brow it grazed
of Morgoth's sleeping head, and dazed
theirs hearts with fear.

(HoME III, The Lays of Beleriand, The Lay of Leithian, 4143-4151,4160-4166)

Angrist - 'Iron-cleaver', the knife made by Telchar of Nogrod, taken from Curufin by Beren and used by him to cut the Silmaril from Morgoth's crown. 215, 219

anga - 'iron', Sindarin ang, in Angainor, Angband, Anghabar, Anglachel, Angrist, Angrod, Anguirel, Gurthang; angren 'of iron' in Angrenost, plural engrin in Ered Engrin.

ris - 'cleave' appears to have blended with the stem kris- of similar meaning (a derivative of the root kir- 'cleave, cut', q.v.); hence Angrist (also Orcrist 'Orc-cleaver', the sword of Thorin Oakenshield), Crissaegrim, Imladris.

(Silm, Appendix)