A gradual loss of hair, common in humans, especially males.

plural of diffraction pattern

plural of moiré pattern

A pole-mounted steel board, usually whitewashed, used by shotgunners to assess the spread of the shot.

(linguistics) A string-matching pattern based on text tokens and syntactic structure.

plural of durational pattern

plural of holding pattern

(US, television) A test signal, typically broadcast at times when the transmitter is active but no program is being broadcast.

plural of integumentary pattern

(aviation) A path taken by an aircraft waiting to land. / (idiomatic) Any failure to advance; useless or unproductive activity.