directrix

1. Mathematics A fixed curve traversed by a generatrix in generating a conic section or a cylinder.

2. The median line in the trajectory of fire of an artillery piece.

3. A fixed curve with which a generatrix maintains a given relationship in generating a geometric figure.

4. A straight line the distance to which from any point of a conic section is in fixed ratio to the distance from the same point to a focus.

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Top Words by points	Points	Word Game
directrix	19	Scrabble

2 Letters	Scrabble® Points
xi	9
id	3
it	2
ex	9
et	2
er	2
ed	3
re	2
de	3
te	2
ti	2

3 Letters	Scrabble® Points
ted	4
err	3
tix	10
ice	5
ire	3
tie	3
rec	5
red	4
rei	3
ret	3
rid	4
tec	5
tic	5
dex	11
die	4
dit	4
rex	10

4 Letters	Scrabble® Points
irid	5
ired	5
iced	7
ride	5
rice	6
rite	4
tide	5
tied	5
tier	4
tire	4
cert	6
diet	5
cedi	7
etic	6
edit	5
dire	5
exit	11
dirt	5
dite	5
dice	7
cire	6
cite	6
cred	7
crit	6

5 Letters	Scrabble® Points
cirri	7
crier	7
cited	8
citer	7
cried	8
riced	8
cider	8
teiid	6
tired	6
trice	7
tried	6
trier	5
xeric	14
drier	6
edict	8
icier	7
dixit	13
direr	6
dicer	8
recit	7
recti	7
ricer	7
rider	6

6 Letters	Scrabble® Points
credit	9
dicier	9
direct	9
tidier	7
triced	9
citied	9

7 Letters	Scrabble® Points
rectrix	16
dictier	10
dirtier	8
editrix	15

9 Letters	Scrabble® Points
directrix	19