mastoiditis/mastoyʹdietis/ noun

• long-term
• long ton
• longueur
• long vacation
• long wave
• longways
• long weekend
• long-winded
• longwise
• lonicera
• loo
• loofah
• look
• look after
• lookalike
• look as if butter wouldn't melt (in one's mouth)
• look askance at
• look a treat
• look back
• look daggers at
• look down
• look down one's nose at
• looker
• look for
• look for trouble