marie charlotte carmichael stopes (noun)
Birth-control campaigner who in 1921 opened the first birth control clinic in London (1880-1958).
santa maria de belem (noun)
Port city in northern Brazil in the Amazon delta. Main port and commercial center for the Amazon River basin.
blue jet (noun)
Atmospheric discharges (lasting 10 msec) bursting from the tops of giant storm clouds in blue cones that widen as they flash upward.
space-reflection symmetry (noun)
(physics) parity is conserved in a universe in which the laws of physics are the same in a right-handed system of coordinates as in a left-handed system.
class psilopsida (noun)
Whisk ferns. Comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs.
mirror symmetry (noun)
(physics) parity is conserved in a universe in which the laws of physics are the same in a right-handed system of coordinates as in a left-handed system.
fifty-fifth (adjective)
The ordinal number of fifty-five in counting order.
st. mary of bethlehem (noun)
Port city in northern Brazil in the Amazon delta. Main port and commercial center for the Amazon River basin.
conservation of parity (noun)
(physics) parity is conserved in a universe in which the laws of physics are the same in a right-handed system of coordinates as in a left-handed system.
parity (noun)
(obstetrics) the number of liveborn children a woman has delivered.
