Thou didst divide
parar (paw-rar')
to break up (usually figuratively), i.e. to violate, frustrate
the sea
yam (yawm)
from an unused root meaning to roar -- sea (-faring man, (-shore), south, west (-ern, side, -ward).
by thy strength
`oz (oze)
strength in various applications (force, security, majesty, praise) -- boldness, loud, might, power, strength, strong.
thou brakest
shabar (shaw-bar')
to burst -- break (down, off, in pieces, up), broken(-hearted), bring to the birth, crush, destroy, hurt, quench, quite, tear
the heads
ro'sh (roshe)
the head (as most easily shaken), whether literal or figurative (in many applications, of place, time, rank, itc.)
of the dragons
tanniyn (tan-neen')
a marine or land monster, i.e. sea-serpent or jackal -- dragon, sea-monster, serpent, whale.
in the waters
mayim (mah'-yim)
water; figuratively, juice; by euphemism, urine, semen -- + piss, wasting, water(-ing, (-course, -flood, -spring).